Now, anybody can look for a strong cylinder head. Going from the passenger car size port to the CJ size port will gain the most performance gains. All flow numbers for FLO Headworks Ported heads come from their Web Site. (note : the cylinder is required with the top crankcase half) Pump Modifications - Pump blueprinting offers much better "hook up" in rough water conditions and is an important asset to machines that will be run hard in rough water conditions. No, the Cathederal port heads are tinker toys compared to the LS3 heads. The results? With I-M Shield installed, the LS3 put out 476 rear-wheel horsepower at 6,300 rpm, and 434 pound-feet of torque at 5,400 rpm on the Dynojet chassis dyno. Exhaust side: The MPG port plates' special tongue shape fills the floor area, allowing more airflow through a smaller port. It pulls all the way to rev limiter!. Expert engine builders like BES know how to get all of the horsepower safely out of a cylinder head whereas a standard head porter may gain horsepower from their head porting, expert porting and a precision valve job can many times unleash 50% to 100% more power. The level of gain is determined by how good/bad the stock head is matched to the engine. If anyone has had a good port job done, I'd be curious what gains they saw. 040 Head Gasket Bore inches Stock 88, 96=3. 6 CFM and the Small PoKLR650 will deliver 346 CFM at 0. These days its almost the same money to buy an aftermarket head as it is to have the stock ones ported and have larger valves installed. While Chevrolet wanted to provide the ZR1 with some serious grunt, they also had to ensure that the engine would be able to provide the durability and reliability that customers would expect from a factory-produced road car. since they used cams with lift in excess of the max. couple of stones I could add 50 hp to and engine just by porting a stock head and that's no bull , I have a very good understanding of engines and what areas to modify for more power and what don't work. I wish everyone did because one data point is easily manipulated. at the wheels. The flow numbers, cfms, are calculated to 28" of water. This also includes some work on the cross over port to guide for best flow. Most importantly, one must know the overall condition of the heads before attempting any performance modifications. If you’re curious as to what difference backcutting the valve makes, here’s another test. It's not likely that many people will actually need to port these heads, but the increased efficiency would make it worthwhile. 95 25534431 SB Chevrolet Complete Large Port Vortec Bow-Tie Cylinder Head $499. Get a brand new head for a little more than the price of exchange! No exchange required!!. You can see to as much as 40-50 Hp if you ahve a 58 MM TB, 1 3/4 LT hedaers, 3" true duals, etc. Fuel Moto carries camshafts produced by Wood Performance, S S Cycle, Cycle-Rama, Zipper's Red Shift, Feuling, and Andrews Products for Harley-Davidson motorcycles. Don't expect to pick up a bunch of power by just getting a valve job with an aggressive narrow seat. I have not ridden the bike since the changes were made but Lee has run a personal best of 9. Making the ports wider does not change the port timing but grinding the top of the exhaust or transfer ports does. 2L engine with a stock long block, I decided to conduct my own scientific test. This intake was designed around the Z06 manifold. The manifolds were often tested in port matched or internally ported form, leading to over 50 different intake manifold configurations. She stays burning rubber without a handbrake lol. 2017 Camaro SS HP tuner (low hp gains) Not sure if the ported throttle body is making the extra 16hp or not. The newly redesigned Vortec cylinder heads were intended to replace the swirl-port Throttle Body Injection heads that were previously used on GM 350 trucks. Your unported heads will cost you about 60 to 75 HP. $2000 returnable core charge must be paid when purchasing the heads unless you are sending in your head to be ported. 2010-2015 Camaro V8 LoudMouth Axle Back Exhaust with 4" Tips. You will likely see the most gains through the cams and heads together. some companies were claiming about 380-400whp with their ported 243 head and stock cam! thats amazing, and still sound stock and drive stock. What did you gain in either ET or RWHP/RWTQ with ported stock 243 heads versus your stock 243 heads. Couple that with the smaller ports' higher velocity (torque) and you get the best of both worlds, up to a certain point. Lingenfelter offers our CNC ported version of the LS7 aluminum cylinder head used on the 2006-2009 C6 Corvette ZO6 that is the same as what is used in our 630 horsepower & 660 horsepower C6 ZO6 packages. 58hp is about all you'll be able to get on the stock carbs, doesn't matter what the rest of the combo would max out at since they become the. You can see to as much as 40-50 Hp if you ahve a 58 MM TB, 1 3/4 LT hedaers, 3" true duals, etc. 5" exhaust piping. Another aspect of these production heads is that the 1981–1987 318 4-barrel engines used 360 heads as part of the E48 high-performance 4-barrel or police option. Don't expect to pick up a bunch of power by just getting a valve job with an aggressive narrow seat. The port became much more efficient by balancing the velocity (making it more uniform) From an airflow standpoint, they flow enough air to support 140-150 HP in stock form. 164 km; Ute; Manual; 8 cyl ; For sale or swap Vz ss manual thunder Holden By Design special order 160###kms L98 engine Ported polished and decked ls1 heads Custom grind crow cam 1 7/8th headers into a 3” collector and full 3”system. BBC 454 to 470 CID with AFR 265 or 290 Oval Port heads to max of 6200 rpm. Sorry I don't have all the specs with me right now, but I'm currently running the following: Block bored. HD RPM Series Drive Belt. The first step when selecting a camshaft is to make an honest appraisal of your engine (compression ratio, head flow, etc. 500lift @28in. Edit: As said before, if you port and polish the head, you might as well get the manifold and gasket matched to the head. Head porting and polishing alone usually yields 5-10 hp and Nm of torque increases. Over the past few months, we have been extensively testing different machining techniques on the lower VHR intake manifold to help generate more horsepower for the Nissan 370Z & Infiniti G37. Bolt on a set of fully assembled heads for instant power gains or custom build your engine’s top-end around a set of bare castings! Plus, you can turn up the horsepower even more by choosing heads with CNC-ported runners and chambers, CNC-profiled chambers, raised exhaust runners, and other enhancements. I thought this was a discussion that would be brought up sooner or later, so why not. Seeing other heads on the market, most are knocked back the center of the 2 ports and made it appear to be a larger runner. here is the results we have all been looking for, of course with all great tests, you end up with more questions than answers. If you port the 351W head, it only gets better. I am afraid that they will not know how to port a dogleg exaust port without ruining the head. MMR Stage 3 Ported 3V RACING Cylinder heads MMR Stage 3 ported and polished cylinder heads feature 306/222 CFM Ports, gain 45-50 More HP on stock applications and up to 80 more HP on Forced induction applications. Need to give your 1984-1996 C4 Corvette a shot in the arm? Corvette Mods carries the best selection of performance upgrades for your C4 Corvette. Welcome to Modern Performance. Most will support around 1200 hp while only having a minimal pressure drop between the inlet and outlet. West Coast Racing has 5. I saw a post where Vengeance just ported a blower and put it back on the car ( all stock) picked up something like 25 hp and 40 Tq all under the curve. The 351W head gives the 289/302 plenty of breathability with its larger intake and exhaust ports and larger valves. Package eight shows what ported heads can do for a 360. The HHP/BES heads are track proved out to pick up a 25 to 30 HP gain. between peak torque and peak horsepower. 1285cc Single port 1965–1970 Twin port 1971–1975. Technik Engineering offers CAMs and Ported Heads for a 63HP+ gain. ($3000 Cryo and polished gears. 3L V6 and 5. Running the CNC-ported heads on the otherwise stock LS3 resulted in a jump in peak power from 493 hp to 505 hp. A milled ported head would be one way to really gain hp. BIG BLOCK CYLINDER HEADS, GASKETS, AND HARDWARE A. read more View Details Sale: $785. I have over 40hrs in my heads. Picking up some 40-50 cfm over stock. With an upgraded Manley stainless 2. With additional add-on performance from IPP such as light weight pistons in various bores and compressions for both N/A and Turbo applications, light weight rods, camshafts, adjustable cam gears & performance cylinder head, we would expect an additional 40-60 horsepower and torque making it a gut wrenching drive. 2 RRC Manifold J37 Throttle Body Hybrid Racing Cold Air Intake Buddy Club Race Header GReddy Racing Ti-C Exhaust Stock Internals with Compression 11. -Alba Racing cylinder head porting. The pink rods was the rod used in the early HiPo small block chevy motors. Cutting the intake manifold off of the cylinder head and having an expert port and polish the head can make all of the difference. 25" exh stock stamped rockers. HRD HOLDEN Starting from $3750 Flowing over 415 CFM, Australian manufactured small block Ford cast alloy CNC ported heads. Basic instructions of cylinder head porting to increase horsepower - Popular Hot Rodding Magazine although the engine gains compression, it is less likely to detonate even at the higher ratio. 4L 2V Romeo and Windsor engines and accept all OE-type 2V camshafts, followers, lash adjusters, and valve covers. The Vortec heads offer great intake port flow despite the rather small 1. These modifications will increase airflow up to. Easily bolt on an additional 80+hp using this program. The throttle body opening on the stock LT1 manifold is 52MM and the stock tb is 48MM. The ported LS3/L92 heads featured sizable intake port volumes of 279 cc; while not much of an issue on our 468ci stroker, that might be a tad large for a small-displacement LS. This is caused by removing too much material during porting and polishing, causing improper induction, pressure leaks and poor heat displacement in the cylinder head and piston chamber. A good example is when people gasket port match their intake and heads port window, all they are doing is creating this hour glass effect-plenum-runner-port going from a larg plenum area -then bottle necking down through the runner-then opening up again at the manifold exit/port window just to immediately taper off and squeeze by the push rod. These numbers are right on target for the the factory ratings on the 340 high performance which were 275hp at 5000 rpm, and 340 lbs/ft at 3200 rpm. I’ve got the opportunity of getting a set of new Screamin Eagle MVA CNC Ported heads (16925-08) at the right price. At the end of the day, it isn't logical to spend $500 for someone to port these iron heads for a measly 30HP. My heads where ported on the intake side and are pretty large for gulping in initial air. Welcome to Modern Performance. 351W Cylinder Heads. With my converter hopefully I will cover up the tq loss of the MSD down low and gain usable HP up top with no loss to 60ft. Redline PHASE 4 ZL1 Hydraulic Roller Camshaft with 38% Fuel Lobe. I wish everyone did because one data point is easily manipulated. 103mm Billet Throttle Body. Unported LS9 Cylinder Heads. Stock Vortec heads are limited to 0. The Stage I 225/236 camshaft rep. This is the info from HHPs website. 810" Exhaust. Most importantly, one must know the overall condition of the heads before attempting any performance modifications. (They weren't too happy when I brought it in to dyno) Performer RPM Air Gap Intake. The port is very long and small. Depending on the engine specification, that translates into a potential power gain of at least 15bhp. Your question relates to porting the Vortec heads to improve the flow, which is a great idea. Edelbrock FM553. A Cosworth CNC-ported 4G63 head flow about 10-percent better on the intake and nearly 20-percent better on the exhaust than the factory heads. Any help would be great. The improvement in “breathing” increases power all the way across the rev range, and adds smoother running and greater reliability, all without adding parts or using more fuel. The hp return on investment with heads alone isn't worth it. stock port matched 049 heads should have no strain getting into the 550-600 HP range if built the the existing valves, not sure you would get a huge gain with larger valves as they will not be the limiting factor. We also have a 1-3 day turnaround. "ended up costing roughly $4k just in labor. HRD HOLDEN Starting from $3750 Flowing over 415 CFM, Australian manufactured small block Ford cast alloy CNC ported heads. Porting-Back in the 70's "Porting" actually meant grinding the ports larger. 164 km; Ute; Manual; 8 cyl ; For sale or swap Vz ss manual thunder Holden By Design special order 160###kms L98 engine Ported polished and decked ls1 heads Custom grind crow cam 1 7/8th headers into a 3” collector and full 3”system. The Victor size was close but the Performer is significantly smaller. Description. The d-port head looks like a set of. I dont see why horsepower would have anything to do with a decision to port heads, I have ran a 3. To be fair Jazzman, porting the exhaust manifolds is about a 6 hp gain and when I ported the heads, of course with a lot more cfm from the carb, the hp bounced up from 107 hp at the wheels to 132 hp from 4,000 rpm to 6,000 rpm. The factory heads are based on the LS3 heads. Port Polishing - posted in Engine: Hello All, just thought about putting this thread up, on how a cylinder head inlet/exhaust port polishing makes a difference or not? Did read here how polishing makes fuel droplets on the port walls, and how Oldjohnno has mentioned in the past about fuel droplets are good in the red head. couple of stones I could add 50 hp to and engine just by porting a stock head and that's no bull , I have a very good understanding of engines and what areas to modify for more power and what don't work. Heads are not drilled for steam holes that are required on SBC 400 engines. On 10:1 Compression engines, out of the box performance is usually 50+ HP. Also ported my throttlebody. , with 75 ft. UNVMATT New Member. After the intake cam mod and head porting the bike tuned out at 190 HP on 93 octane pump gas. One of the easiest ways to gain 20 to 30 horsepower is to purchase ported and polished aftermarket cylinder heads. 5-Axis CNC Ported for 2. Do a port and polish on your cylinder head to decrease turbulence in the air flow. In that case, a new valve seat may need to be installed or a whole new cylinder head purchased. (Read all info on increasing POWER below). These upgraded 392 heads include improved valve springs, retainers and locators and allow support of cams with up to. Discussion Starter • #1 • Dec 9. "Demo" port Ship 1 cylinder head to our place of business. Mike or Pete could chime in on the quality of the work. When we decided to sell After-market Performance cylinder head the decision was easy! When performance counts, Patriot Performance Stage II/III CNC-ported cylinder heads for the LS1 / LS6 / LS2 series engines. In the case of the intake passages on the Jaguar V12, however, this may produce undesirable results. 010 over for 408 ci Domed Wiseco 9:6:1 pistons Stock oval port heads 2. Cathedral port cylinder heads have been mistakenly dismissed by many in LS-series circles for being “old-tech. The level of gain is determined by how good/bad the stock head is matched to the engine. How much of a hp gain does a port and polish job offer and who does the best job for the price I agree I had my head ported by BCS performance and he put a cp 13. On the polished red head of mine, I had noticed black carbon build up. The porting consists of a competition valve job on both intake and exhaust. 585 flat tappet, tm-6 intake, 11. 21 This episode of Engine Masters presented by AMSOIL reinforces the fact that Steve Dulcich is not just the guy in the back of the dyno room—he’s a legit engine master. Aluminum Cylinder Head Small Six aluminum cylinder head information. 01 QS Z06, Coupe Performance ported 243 heads, FTI Street-Sweeper-HT cam, ported FAST 78, 1 3/4" longtubes, H-pipe w/ high-flow cats, B&B PRT catback, Vortex Rammer, ported throttle body, tuned by. 7L V6 stroker in action from Krayem Racing Ginetta G50 GT4 on-board camera. And all the HP is in the heads on those suckers, so I'm assuming that an aggressive port and polish will yield some decent hp gains. You could pretty much eat off it. Recommend head gasket for 4” bore engines is the Fel-Pro 1003 style gasket. Trick Flow products perform as advertised and exceed customer's expectations for performance and value. There is also the SVO 2v head. We all know that CNC heads are good. Fast and reliable HP with a minimum amount of work, no expensive motor tear down to install. My mechanic ported a SC for another guy and told me he wouldn't recommend it for me, because he didn't see much difference for the price, which was roughly $1200. 99% increase in horsepower, which can provide a measly 8. I have not ridden the bike since the changes were made but Lee has run a personal best of 9. Ive heard of people gaining 40-50hp with stage 2 porting, and cams. Our 125's have won national titles, holeshot mammoth, glen helen, and regionals. CNC ported and port design by HVH. The 1999-2004 2v heads are the power improved (pi) heads. Remember, bigger isn’t better when it comes to diameter so stick with 1-3/4? head pipes. The level of gain is determined by how good/bad the stock head is matched to the engine. A well ported head will make more average power than what you have now but if peak HP is all you're concerned with, and dyno sheets, then I would get a set of 39FCRs and dual exhaust and do the head last. If anyone has had a good port job done, I'd be curious what gains they saw. The 1999-2004 2v heads are the power improved (pi) heads. As you can see by the flow numbers, this test began with a pretty good set of heads in the ported 461Xs. The Stock 250 head is a VERY inefficient design and leaves A LOT of Performance on the table. Corvette & 2010 Camaro customers can now send in their heads to be ported! Dyno Tested 25+HP Gains Over Stock 6. NOTE: When using TA Aluminum heads on 400 and 430 engines, you must use pushrod oiling, i. I have a dremel tool so that should work. 1rwkw and 710nm torque. I have over 38 years experience working with some of the best 2 stroke engineers in the world. 59" Valves; PRC Double Spring Kit AVAILABLE; Completely Assembled & Setup To Your Specs!! Service Includes: Cylinder Head Cleaning; CNC Valve Job; CNC Porting; Milling to customers specs; Fully Assembled; Dyno Tested 25+HP Gains Over. "Oval" - Machined to fit Pro-Filer Oval Port Heads "RP" - Machined Opening to fit Pro-Filer Sniper X Heads (Rectangle Port) "R" - Small Port Opening, must be port matched to fit "D" - Machined Opening to fit Dart 335cc and other heads with a similar port locations & openings. Be sure to have them cleaned and magnufluxed by a competent machine shop. This also changes the port timing. She stays burning rubber without a handbrake lol. 00: For the Twin Cam rider who wants everything out of his bike that it can deliver, NRHS offers the Stage 3 CNC treatment. A good example is when people gasket port match their intake and heads port window, all they are doing is creating this hour glass effect-plenum-runner-port going from a larg plenum area -then bottle necking down through the runner-then opening up again at the manifold exit/port window just to immediately taper off and squeeze by the push rod. Just to get fellow members ideas, experience, thoughts, etc. CI Stage 3 Cylinder Head Porting Service 420a. 600″ intake and exhaust valve combination, our Stage 2 ported GM square port LS3 porting services are what your ride needs to make MAX power without spending max money. Peak torque was up slightly, from 485 lb-ft to 498 lb-ft, though at a slightly lower. In 2003, Robert Stiegemeier began work on roots style superchargering in an effort to increase efficiency and power through porting. 02-inch intake valve for max-performance applications. Good question. A 360-hp 350 with stock 186 factory head casting went up to 388 after a morning's work on the heads. 25% underdrive Has electronic cutouts at cats connected to ecu Will be going to 2” primary’s and 4” collector and retuned Soon if not sold VCM otr. TFX fuel injectors, an SFI-approved. CI Stage 1 Cylinder Head Porting Service 420a 3. The factory heads are based on the LS3 heads. Porting is usually done to increase airflow and horsepower at high RPM. Couple that with the smaller ports' higher velocity (torque) and you get the best of both worlds, up to a certain point. When combined with a cam change, gains of over 100 hp can easily be achieved with a mild cam. intake manifold by Bryce Mulvey. Making the swap that much sweeter was the fact that the power increased through. The twin port head does, however, have more scope for performance improvements. 5 cnc ported heads (31x cfm @. A well ported head will make more average power than what you have now but if peak HP is all you're concerned with, and dyno sheets, then I would get a set of 39FCRs and dual exhaust and do the head last. 190hp - 200hp Getting towards the upper limit of 304° cams, and you'll also need to have the compression up to a good 11:1. ive also heard that you can lose power porting unless you do it right. Moe's Performance High Performance Track PLUS (HPT+) cam was designed for the everyday drivers that also want to put up impressive times at the dragsrtip. 300 : 223: 170. Also header will be. here is the results we have all been looking for, of course with all great tests, you end up with more questions than answers. 2 at 605hp, and now your race port blower with cams e85 and nos making 570/525 & 705/823 , and I must say even though I loved the whipple and kenne bell I like the drivebility of my current setup. 200hp is about the limit for a small port head, no matter what the porting, so from here on the big port is the way to go. 95 25534371 SB Chevrolet Bare Large Port Vortec Bow-Tie Cylinder Head $328. These days its almost the same money to buy an aftermarket head as it is to have the stock ones ported and have larger valves installed. Very rarely will someone lose torque in porting their heads (I've never seen it). Remember, bigger isn’t better when it comes to diameter so stick with 1-3/4? head pipes. ) and your driving plans (street, road race, etc. While Chevrolet wanted to provide the ZR1 with some serious grunt, they also had to ensure that the engine would be able to provide the durability and reliability that customers would expect from a factory-produced road car. Sorry I don't have all the specs with me right now, but I'm currently running the following: Block bored. With stock manifolds you wont gain much around 10 hp at most. Any of these heads, given a serious but still straightforward porting job, flows enough air for a 10. Introducing RaceIQ Stage 3 ported heads for the m113 platform. To make the Trick Flow heads really perform you have to spin the motor pretty high. And you won’t question that after you see his homegrown porting job on a set of Edelbrock aluminum cylinder heads for a small-block Mopar pick up a whopping 92 hp! This episode of Engine Masters reinforces the fact that Steve Dulcich is not just the guy in the back of the dyno room—he’s a legit engine master. 7 mm) for later Generation 1 motors, and. 6 head was the head porters conclusion was a good gain in flow could be had by raising the exhaust port to reduce how sharp the short side radius was. We have developed a TRUE Performance Enhancer with this Custom Billet Head designed specifically for mountains and single/dual track riding. Today's aftermarket cylinder heads come with a high price tag. This helps emissions and idle stability, but reduces flow. All build up with Vortec heads must have had the upgraded springs ect. The build above is an amateur build. Trick Flow Specialties is a leading designer and manufacturer of high performance cylinder heads, intake manifolds, and engine components. 12/17 But Head B features an 180cc intake port, while Head A was more than 200cc, so which one do you think might work. One would notice that the round port actually looks like a sideways "D" that is pointing upwards. Also how hard is it to port the heads and intake by yourself. The peak HP gain was nil. This combination provides excellent horsepower gains while maintaining a strong torque curve. Thanks in advance. You will see most gains from cleaning up below the valves into the port. Arrington Phase 6 CNC Ported Heads for 2011 and up 392 (6. The Twisted Wedge 185 series heads fit all 1996-2004 4. Strange as it may seem, just making the intake and exhaust passages bigger will not always improve performance, and may actually hurt it. The only way to validate what the performance gain was for any change is to have dyno runs before and after. 750cfm pumper carb. Ive done multiple sets of iron mopar heads. UNVMATT New Member. Get a brand new head for a little more than the price of exchange! No exchange required!!. The issue is what do you want to use the car for. 95 25534371 SB Chevrolet Bare Large Port Vortec Bow-Tie Cylinder Head $328. It may be possible to port the edelbrock heads to gain flow. This time using a band new stock 1600 twin port head (35. every time. Ported heads yield more power and lower boost, so it's preferable, imo. The build above is an amateur build. Why? Because it is common knowledge, However lets have a look at what the process is for your cylinder heads that gain so much horsepower & torque! CNC machining of your cylinder heads intake port; CNC machining of your cylinder heads exhaust port. Which also sounds like a gee-wiz statement. It pulls all the way to rev limiter!. ($800 Allows full throttle clutchless up shifts) -Turners axles x4 ($3000 These are the best axles money can buy. I've done a fair amount of porting and polishing over the years. Fuel Moto carries camshafts produced by Wood Performance, S S Cycle, Cycle-Rama, Zipper's Red Shift, Feuling, and Andrews Products for Harley-Davidson motorcycles. The 40mm intake port has an extremely small port volume of 62cc and flows an incredible 162 CFM and over 300 ft. 95 25534371 SB Chevrolet Bare Large Port Vortec Bow-Tie Cylinder Head $328. - All E-Street Cylinder Heads are sold in pairs - Dyno tests showed a gain of 16 hp and 11 ft-lbs of torque over our overseas competitor; CNC Ported: No: Combustion Chamber Volume: 64 cc: Deck Height: 9. I know I had to make some data entry errors and some variables are blank because I couldn't find the info so please post any corrections I need to make. 15% Lower Supercharger Drive Pulley. P4120437 Porting Template, 2. 020, Eagle intake manifold, 6. Seeing other heads on the market, most are knocked back the center of the 2 ports and made it appear to be a larger runner. Just like the title says, How much more h/p gain will I have on my car if i install 03 zo6 243 stock heads to my gto. We open up the Intake Port enough to still use the same Intake Manifold and gain overall performance without making the Casting thin. Redline PHASE 4 ZL1 Hydraulic Roller Camshaft with 38% Fuel Lobe. 95 25534421 SB Chevrolet Complete Small Port Vortec Bow-Tie Cylinder Head $489. The engine will love the upgrade but your wallet may not. More port work is performed on the stage 3 head than the stage 2. This high performance aluminum cylinder head is a direct bolt on for Ford 289/302/351W engines and retains OEM exhaust, intake, rocker arm and accessory mounting locations. I wanted to add BBK headers to the GT40 heads, but I'm not sure I'll need them. How much addt'l h/p can I expect if i get the heads ported ?. Welcome to Modern Performance. Edelbrock 4150 Victor Intake ported Cylinder Heads: TFS street heads with mild clean-up and Victor port match Roller rockers. This engine was an improved version of the early design and had dual oil pressure-relief valves and a stronger crankshaft with a longer 69 mm stroke. This may not sound like a big deal, but it makes more of a difference than just opening the ports slightly (Again, my experience with VW Type 1 engines). Head porting hp gains. Our GM LS3 CNC ported cylinder heads were designed by racers for racers. Our 80mm throttle body is a quick way to add 15 horsepower. In other words, if you have a well built 360, with 240 @ 050/. All flow numbers for Flowtech - Steven Magnotti Ported heads come from them Contact updated Feb. With an upgraded Manley stainless 2. 810" Exhaust. Record Setting Street and Race Heads. The access holes allow us to modify 100% of the manifold. intake manifold by Bryce Mulvey. Fits 289/302/351 Windsor engines ; Cast from prime 356 T6 aluminum ; Heads retain Ford OEM intake and exhaust port location and flange. per second port velocity, right off the shelf! The 35. 88 intake valve, which can easily be upgraded to a 2. It pulls all the way to rev limiter!. 2 at 605hp, and now your race port blower with cams e85 and nos making 570/525 & 705/823 , and I must say even though I loved the whipple and kenne bell I like the drivebility of my current setup. MMR Stage 3 Ported 3V RACING Cylinder heads MMR Stage 3 ported and polished cylinder heads feature 306/222 CFM Ports, gain 45-50 More HP on stock applications and up to 80 more HP on Forced induction applications. Efficient, dependable and proven, it has set the standard for excellence and value. It may be possible to port the edelbrock heads to gain flow. It may be the best flowing 3x2 manifold. I have seen many 360 dyno tests that show this same combo will duplicate the 450 - 460 h. With a torquer pipe, cylinder porting and head machining you are now looking at a healthy 32 HP at 6750 RPM, and that is still with the stock 30mm carb. The guy will do the following for a $1000: (Upper/Lower)-Port match upper/lower polish the runners and port match to the head. Most will support around 1200 hp while only having a minimal pressure drop between the inlet and outlet. I searched Supraforums and found posts showing increased flow, but nothing about horsepower gains. • GenX 260 Square Port Cylinder Heads for GM LS7 • Active Fuel Management Delete Kits • GenX 255 Square Port Cylinder Heads for GM LS3 • Valve Cover Spacers • GenX 205 Cathedral Port Cylinder Heads for GM LS 4. Much of this gain over the stock 345 hp Boss 302 rating can be attributed to Westech's lower 140 degree engine coolant test. -Ported heads-CJ sized valves-Cam with. 0l CNC port programs for GM cast cylinder head that you have to have! West Coast Racing has programmed a CNC stage 2 porting program that really is an improvement over the stock cylinder heads! We have graphed it out and you can see the improvement in airflow over the oem heads. Record Setting Street and Race Heads. I will say that just bolting on a set of W2 heads with no other changes is a waste of effort consdering the cost of the heads and rockers. Unfortunately, this is not the case. The list provides information on the maximum horsepower recorded, the type of engine cases, the engine displacement in cubic inches (CID), type of cylinder heads with who did the modifications, type of camshaft, type of carburetor, type exhaust system, owner of the bike, the type of frame the engine was mounted in and the source of the data. Comes Standard with an 85 MM Throttle Body opening, and has a Titanium Powder Coat Finish. Technical yes, since engine casts are a bit different, but the gain you will find from head to head will be much, much less, than the gain from STR porting. With an upgraded Manley stainless 2. 21 This episode of Engine Masters presented by AMSOIL reinforces the fact that Steve Dulcich is not just the guy in the back of the dyno room—he’s a legit engine master. Oval-port heads with 2. Description: Serious horsepower for your Big Block Ford engine, heads sold individually and are fully assembled. 4L 2V Romeo and Windsor engines and accept all OE-type 2V camshafts, followers, lash adjusters, and valve covers. We have developed a TRUE Performance Enhancer with this Custom Billet Head designed specifically for mountains and single/dual track riding. He ordered the 1st set heads from Josh to test on his Mighty Challenger. So anything you can do to make that happen, will increase the horsepower and torque a bunch. When installed in properly PnP'ed heads, gains may be greater) (Our Daily Driven J32a3 Picked up 36whp/14wtq - Installed into our *Hp Stage 1. Ford Racing 4. (Ported 160-170 or more). 8/351W) - Significant power gain via porting stock 302 heads? - How much is torque and hp could I gain if iI had my stock 79 302 heads ported and polished? I'm running the stock autolite 500 cfm 2bbl. I suggest a intake port volume of 195 to 210 cc for a strong High perf street strip 383. 327 engines ranged from 250 hp to 375 hp depending on heads and fuel supply. The port became much more efficient by balancing the velocity (making it more uniform) From an airflow standpoint, they flow enough air to support 140-150 HP in stock form. He also installed the HHP cam shaft on that car, which as it sits makes 920 HP at altitude. Regardless of intake port size the two different castings have identical flow curves on the intake side. Made in the U. You can buy new ported and polish heads that are stronger and lighter then your stock heads. This Tech Tip is From the Full Book, HIGH-PERFORMANCE …. The following is a list of tips that every methanol fuel user should be aware of. here is the results we have all been looking for, of course with all great tests, you end up with more questions than answers. Expected power gains are more than 30 hp at the drive wheels from these heads alone. 5 ratio rocker arms, Trick Flow Track Heat intake manifold (TFS-61600113), Trick Flow Track Heat Pro 950 cfm carburetor (TFS-20950R), Hooker Super Competition headers with 1 7/8. 351W Cylinder Heads. 7L (Vortec) • GenX 215 Cathedral Port Cylinder Heads for GM LS1 • GenX 225 Cathedral Port Cylinder Heads for GM LS2. 5 cnc ported heads (31x cfm @. 645” of lift. AFR’s, MONGOOSE, LS1 Cathedral Port cylinder heads are 100% 5-AXIS CNC ported and made with A356 aluminum. Porting and polishing your cylinder heads will give your engine more horsepower and make it run more smoothly while increasing fuel efficiency. 01 QS Z06, Coupe Performance ported 243 heads, FTI Street-Sweeper-HT cam, ported FAST 78, 1 3/4" longtubes, H-pipe w/ high-flow cats, B&B PRT catback, Vortex Rammer, ported throttle body, tuned by. These heads flow 345cfm @. A bigger gain than from bolting on S&S heads; Power Port: 2. As you’d expect, Kingmaker is a truly epic game in both size and scope. This also changes the port timing. To gain flow above that point, the entire port will need to be reworked (which will in turn help the low and mid-lift flow. These ported and polished are made for the true street and track enthusiasts. On a Gen 3, my opinion is to port the intake manifold and heads together. To make the Trick Flow heads really perform you have to spin the motor pretty high. On 10:1 Compression engines, out of the box performance is usually 50+ HP. 7L V6 stroker in action from Krayem Racing Ginetta G50 GT4 on-board camera. Shave Circle-B head for 10. They give your engine the room to breath and make more power throughout the RPM band. BLM stands for "block learn multiplier. The most bang for the buck! Includes port matching, as above, and blending of the plenum and the intake dividers. Fits 289/302/351 Windsor engines ; Cast from prime 356 T6 aluminum ; Heads retain Ford OEM intake and exhaust port location and flange. Why? Because it is common knowledge, However lets have a look at what the process is for your cylinder heads that gain so much horsepower & torque! CNC machining of your cylinder heads intake port; CNC machining of your cylinder heads exhaust port. A variety of OE Gen 3 heads are available, including an iron small port (initially used on the 4. These heads have proven to be capable of 680 rwhp in a naturally aspirated, hydraulic roller, street engine. In the advertising blurb that comes out with these it states that they would suit a 103” with a high lift cam (see below). Twisted Wedge Stage 1 ported intake port: Whether you are just looking to improve your E. But, after that, you'll gain more power from future mods, intake, headers, cam than if you didn't. These heads flow 345cfm @. I have not ridden the bike since the changes were made but Lee has run a personal best of 9. I am debating whether or not to get a set of ported 241s when i get a cam change, I am going for a 228 230 110 or 112 cam and want to know if the $1500 or thereabouts for what only seems to be a small hp gain is worth the cash as the standard heads are pretty good anyway I thought. 050 lift Sanderson Headers. They are machined on our state-of the art CNC equipment for the ultimate combination of performance, reliability and precision. Precision High Performance Porting for Any Outboard from Lake Racer to Formula One! Two stroke marine outboard applications impose several uniquely individual circumstances that are very different from other two stroke engine uses. ) and exhaust valves (1. You'll not only see much higher peak horsepower, but excellent mid-range gains as well- all the while keeping stock-like reliablility. Peak torque was up slightly, from 485 lb-ft to 498 lb-ft, though at a slightly lower. 440zrider85 · Registered. 200 : 154: 115. These numbers are right on target for the the factory ratings on the 340 high performance which were 275hp at 5000 rpm, and 340 lbs/ft at 3200 rpm. Since ported heads will likely gain you less HP that the proper cam choice, they'd likely have less impact on gas mileage. 8/351W) - Significant power gain via porting stock 302 heads? - How much is torque and hp could I gain if iI had my stock 79 302 heads ported and polished? I'm running the stock autolite 500 cfm 2bbl. How much addt'l h/p can I expect if i get the heads ported ?. I would like to run a less radical cam but I don't want to sacrifice any power and I'm not sure how to gain it back if I do use a different cam. Increasing head flow creates more horsepower at the same boost level and works very well with aftermarket cams. The moment I started to copy the GT40P port profiles, big gains began to appear. This high performance aluminum cylinder head is a direct bolt on for Ford 289/302/351W engines and retains OEM exhaust, intake, rocker arm and accessory mounting locations. Its very nice being at the track with iron heads you ported yourself and people get surprised that's all it has with an 8. It has a moderate rough idle to it due to the overlap of the 114 lsa 228/236 cam. See full list on musclecardiy. 58hp is about all you'll be able to get on the stock carbs, doesn't matter what the rest of the combo would max out at since they become the. 5 PnP Heads) *NOTICE/ BE ADVISED* 1. This results in a less hp numbers as well. 700 MXZ Trail Porting (send cylinders, head, and rave valves only) 8 HP gain. A cylinder head setup for testing on an air flow bench. 040 ,if not ,you will have detonation. This is also getting to the limit of what a lightly ported small port head can manage. 75" primary tubes and 3" collector doug thorley headers. 025 in: Deck Thickness: 0. He ordered the 1st set heads from Josh to test on his Mighty Challenger. One of the easiest ways to gain 20 to 30 horsepower is to purchase ported and polished aftermarket cylinder heads. Recommended for radical " Pro Street" or racing applications with displacements up to 605 cubic inches, operating at or below 7400 RPM. Click Here for Edelbrock Aluminum Head Installation Sheet PONTIAC HEAD CHART CASTING NUMBER YEAR FACTORY APPLICATION CHAMBER VOL# CC'S EXHAUST PORT NOTEWORTHY ATTRIBUTES 528511 1958 370 62 D-Port 1. The throttle body opening on the stock LT1 manifold is 52MM and the stock tb is 48MM. I think a not to radical cam that will gain you HP, and maybe more importantly an improved torque curve, is the way. This port design would be considered maximized using the valve sizes that come stock with these heads (2. -Porting stage 3-Custom billet HP head-Reed cage-Custom HP piston-Crankcase coatings. A high flowing head will give you more power, but at high rpm's. We gained 70BHP and almost 60LbFt Torque with the stroker and ported cylinder heads, increasing power from 380BHP to 450BHP. In stock form, a twin-port head only flows marginally more than a single port - remember that stock VW engines aren't designed to rev over 4500 rpm or so. 88 intake valve, which can easily be upgraded to a 2. Heads with smaller ports - un-ported - usually provide better low-end torque than ported heads. The intake port receives a reshaped short turn, chamber deshroud, opening of the pushrod pinch (about an inch into the port), head bolt buldge minimized, a back cut on the intake valve and a blending of valve job into the port. CT Racing have tested methanol fuel extensively over the last five years and have learned how to set up engines and carburetors for most ATV applications. 440zrider85 · Registered. 2010-2015 Camaro V8 LoudMouth Axle Back Exhaust with 4" Tips. The plates fit between the intake manifold and exhaust manifold and cylinder head. Trick Flow products perform as advertised and exceed customer's expectations for performance and value. The power output of the 468 jumped from 692 hp at 6,500 rpm with stock L92 heads to 720 hp at 6,700 rpm with the CNC-ported versions. Full CNC Port & Polish: Please contact us for this service. While subject to the same inconsistency of any factory head, a superior port design and finish make these a very attractive option for larger-cube builds whether road racing, daily driving, or drag racing. The PRC LS3 cylinder heads porting for customers with existing LS-3 cylinder heads. The engine will love the upgrade but your wallet may not. If anybody doubts John Lingenfelter’s genius, behold that his 200 MPH C5 fits this math perfectly. Stud girdle. I saw a post where Vengeance just ported a blower and put it back on the car ( all stock) picked up something like 25 hp and 40 Tq all under the curve. Take a look at the photos below. Note the flow on our fully CNC ported heads). These numbers are right on target for the the factory ratings on the 340 high performance which were 275hp at 5000 rpm, and 340 lbs/ft at 3200 rpm. Horsepower gains are tough to predict, but you will gain power. These have a massive inlet valve size of 2. The port became much more efficient by balancing the velocity (making it more uniform) From an airflow standpoint, they flow enough air to support 140-150 HP in stock form. The list provides information on the maximum horsepower recorded, the type of engine cases, the engine displacement in cubic inches (CID), type of cylinder heads with who did the modifications, type of camshaft, type of carburetor, type exhaust system, owner of the bike, the type of frame the engine was mounted in and the source of the data. Hi, I'm trying to put a long open-ended debate to rest. Reuse Factory Intake Valves: 2. With stock manifolds you wont gain much around 10 hp at most. A cylinder head setup for testing on an air flow bench. If you believe online forum chatter, LS1 cylinder heads can give anywhere between 10 to over 50bhp extra from a port and polish, so it is by no means a linear process. Find Chevrolet Performance LS9 CNC-Ported Cylinder Heads 19328743 and get Free Shipping on Orders Over $99 at Summit Racing! Chevrolet Performance LS9 CNC-ported cylinder heads represent a new benchmark in factory engineering high performance, blending the strength and durability of the production LS9 cylinder head castings with the airflow enhancements of precision CNC porting. Start from a stronger bottom end. Includes a bench flow analysis of both ports. I'm wondering about the difference in port size between the N351 heads and the new Performer RPM intake. The port and chambers are carefully designed to provide the best combination of high flow capabilities and improved port velocity. EXPANDABLE - HP Engine Kits can be chosen with additional parts such as; rods, special head gaskets, copper gaskets for o-ringing of heads and blocks, piston coatings, pin upgrades & more. On a great day porting the snout to 102mm and the blower case in conjunction with a 102mm tb and a good flowing motor (cam, exhaust,4. The Techtonic's StreetPort Head alone provided up to a 4 percent gain in torque and horse power over our previous best, with an extra 3. 5mm exhaust port has a reduced bowl size and increased short turn radius creating phenomenal port velocity. There are multiple methods of obtaining a set of LME CNC ported heads perfectly sculpted for your hot rod:. Those heads are about 320cc intake ports and can handle up to about 725-750 hp. Much of this gain over the stock 345 hp Boss 302 rating can be attributed to Westech's lower 140 degree engine coolant test. It has a roller hydraulic cam, headers, ported heads. On a max ported head a stock torker hurt the flow to the tune of about 8%, but working on the torker brought it back to about 3%. stroker kit from 440 source to combine with these reworked heads along with an Edelbrock rpm dual plane intake, no cam selection as yet. Now, what I have seen is certain porters gain higher hp than others, while achieving less torque than the next guy. 23" Performer RPM - 1. On some V8 engines such as a Chevy LS1 engine, gains of 100 to 150 horsepower have been made – some even claim up to 200 extra horsepower! How to Port Cylinder Heads These are the basic steps to porting your cylinder head. GM's LS engines are the hottest thing to hit the scene since Chevy debuted the first smallblock back in 1955. I dont see why horsepower would have anything to do with a decision to port heads, I have ran a 3. See full list on musclecardiy. If I did have this. Specification needed to make 620 HP as pictured: 10. The "D" option based on a different manufacturer's specifications. The flow numbers, cfms, are calculated to 28" of water. The RZ500 stock engine produces 71 horsepower. Most signifcantly to us, the intake ports were redesigned and hand-polished, allowing Kawasaki say in their offical ZX-14R launch press release: "the new Ninja ZX-14R really does come 'ported' right from the factory". On a great day porting the snout to 102mm and the blower case in conjunction with a 102mm tb and a good flowing motor (cam, exhaust,4. Both intakes utilize the same exterior casting, with one having larger internal runners passages than the other to suit their individual cylinder heads. These modifications will increase airflow up to. From what I understand, at 1600°C NOx is formed because air molecules, nitrogen N2 and. Over the past few months, we have been extensively testing different machining techniques on the lower VHR intake manifold to help generate more horsepower for the Nissan 370Z & Infiniti G37. LS1 LS2 LS3 LS7 Camshafts Valvesprings Spring Kits and Performance LS Parts. Why? Because it is common knowledge, However lets have a look at what the process is for your cylinder heads that gain so much horsepower & torque! CNC machining of your cylinder heads intake port; CNC machining of your cylinder heads exhaust port. 6 55-60 INT MAN 538177 61-62 389 62 D-Port 1. Car makes 420+whp with stock 75mm maf, stock C5 catback and stock LS6 intake. CNC ported blowers, heads from WCCH, new Eaton rotor packs for your LSA blower, Mamo ported. 0 is good for 40hp. 4L) SRT8 Chargers, Challengers and 300Cs are now available. Head porting and polishing alone usually yields 5-10 hp and Nm of torque increases. I have over 40hrs in my heads. If you believe online forum chatter, LS1 cylinder heads can give anywhere between 10 to over 50bhp extra from a port and polish, so it is by no means a linear process. 450-inch lift. Ive heard of people gaining 40-50hp with stage 2 porting, and cams. -Billet HP head-HP Carb Bore and Mod-Custom HP Pipe and Silencer combo-Reed spacer-Custom programmed GET ECU N EW* 2018-2019KTM105 112 National Mod Stage3 | $3600 package price Our stage 3 112 race engine puts 125's to shame. But if you compare the heads across the board, the Edelbrock heads outflow the W2 heads at almost every other point during the cycle. We recommend a high rise dual plane with the center notched. This was pretty good iron in it's day but, at 161cc/62cc, the ports are still small by comparison to todays Hi-Perf stuff which routinely run up at 250cc/100cc!. It all depends on what kind of port and polish job you get, whether you get a 3 angle or 5 angle valve job. 025 in: Deck Thickness: 0. Timeslips or dyno sheets would be great. 5" lift solid cam. This process is done at many machine shops and can cost a good deal of money. 00 and you will need to send us your engine in order for us to install it. 6 55-60 INT MAN 538177 61-62 389 62 D-Port 1. 00: For the Twin Cam rider who wants everything out of his bike that it can deliver, NRHS offers the Stage 3 CNC treatment. With outstanding flow numbers and an efficient port shape, the LME CNC ported LS1 243s bring value and performance together. Using a brand new LS3 crate engine, we started from scratch to build the most powerful LS3 camshafts available in the country. 01 QS Z06, Coupe Performance ported 243 heads, FTI Street-Sweeper-HT cam, ported FAST 78, 1 3/4" longtubes, H-pipe w/ high-flow cats, B&B PRT catback, Vortex Rammer, ported throttle body, tuned by. Technik Engineering offers CAMs and Ported Heads for a 63HP+ gain. The d-port head looks like a set of. Feight, 2009 1 of 23 Disclaimer: The author does not represent a professional head porting service, nor is the author well versed in head porting procedures and techniques. If you go too far with your head work you may actually lose a fair amount of low end horsepower and torque. So far stock cams and exhaust. One positive attribute of the Ford heads is the architecture. Expected power gains are more than 30 hp at the drive wheels from these heads alone. 3L V6 and 5. The Victor size was close but the Performer is significantly smaller. The hp return on investment with heads alone isn't worth it. This upgrade is easy to install and can be swapped out in around half an hour. I will say that just bolting on a set of W2 heads with no other changes is a waste of effort consdering the cost of the heads and rockers. Your engine probably won't breath much better because of your cam, the smaller combustion chamber might bump your compression up a couple of points. Ported heads yield more power and lower boost, so it's preferable, imo. 23" Performer RPM - 1. T4 and T5 peaked within 3 HP of one another with T5 actually holding its head up a bit better after peak but the 11 lb ft of torque sacrificed in the mid- range makes T4 the best choice for the majority of our clients. We've listed the flow numbers for similar stock 462 heads to reveal what the porting work. and he used various shops to complete, none with J experience since he was telling the shops what to do. 0l CNC port programs for GM cast cylinder head that you have to have! West Coast Racing has programmed a CNC stage 2 porting program that really is an improvement over the stock cylinder heads! We have graphed it out and you can see the improvement in airflow over the oem heads. intake manifold by Bryce Mulvey. You might see 15 HP just bolting on the doves 8). The most bang for the buck! Includes port matching, as above, and blending of the plenum and the intake dividers. Also, will I gain any useable horsepower by porting the tri-power intake manifold and carbs?. I have Edelbrock RPM Performers on there right now. We plan any modifications and part selections specifically to suit you. Strange as it may seem, just making the intake and exhaust passages bigger will not always improve performance, and may actually hurt it. This is caused by removing too much material during porting and polishing, causing improper induction, pressure leaks and poor heat displacement in the cylinder head and piston chamber. These heads flow 345cfm @. AFR's 357cc cylinder heads features fully CNC machined intake runners, exhaust ports and combustion chambers; capable of flowing 425 CFM at 0. If I were to see 40-50 hp increase from a port/polish job on my heads, I would be thrilled and call it a day. A bigger gain than from bolting on S&S heads; Power Port: 2. NOTE: When using TA Aluminum heads on 400 and 430 engines, you must use pushrod oiling, i. I suggest a intake port volume of 195 to 210 cc for a strong High perf street strip 383. It is my humble opinion that the $500 would be better spent elsewhere. How much of a difference is this from a cam? Sent from my iPhone using Tapatalk. -Ported heads-CJ sized valves-Cam with. Couple that with the smaller ports' higher velocity (torque) and you get the best of both worlds, up to a certain point. The cylinder heads come with 2 matching CID intake options, one for the JK 390 heads and one for the DM 500 heads. There is also the SVO 2v head. The engines are an interesting mix of technologies, the bottom end is derived directly from the Pantah, head porting is the same on all the models and, with all due respect to the factory as bad as the 4 valve is good. Most full flow header co's claim 50+hp. The port work being done to the valve seats really helps off boost driving. The port and chambers are carefully designed to provide the best combination of high flow capabilities and improved port velocity. Ford Racing 4. GMC Performance Chips are best in class horsepower, torque and fuel economy gains. So anything you can do to make that happen, will increase the horsepower and torque a bunch. It makes more sense to look for a good cylinder head as oppose to allow one or two engine builders have the best engine at the races. Going from a larger port to a smaller port is not good for flow. At the end of the day, it isn't logical to spend $500 for someone to port these iron heads for a measly 30HP. You will likely see the most gains through the cams and heads together. A Cosworth CNC-ported 4G63 head flow about 10-percent better on the intake and nearly 20-percent better on the exhaust than the factory heads. For a street car, this design means excellent throttle response, torque and average power. Porting cylinder heads generally refers to the process of enlarging the intake and exhaust ports of an engines cylinder heads. Lingenfelter LS7 cylinder heads are CNC ported in house to insure that exact tolerances are maintained. To avoid this, cancel and sign in to YouTube on your computer. Porting and polishing your cylinder heads will give your engine more horsepower and make it run more smoothly while increasing fuel efficiency. i have seen some posts on other ls based forums where guys are seeing about 20-40whp with ported 243 heads on stock cammed ls1's. DIY Cylinder Head Porting Gains 92 Horsepower! If playback doesn't begin shortly, try restarting your device. Fox lake claims 150hp from changing to their stage 2 ported heads, stage 2 cams, and valvetrain upgrade. A good result depends on all of the parts working together to support the final number. Follow me on Instagram: www. Those heads are about 320cc intake ports and can handle up to about 725-750 hp. 10" Super Victor - 1. Furthermore, 8mm end holes in the heads ensure that most OE Ford front covers will fit. 700 MXZ Trail Porting (send cylinders, head, and rave valves only) 8 HP gain. Car makes 420+whp with stock 75mm maf, stock C5 catback and stock LS6 intake. The port became much more efficient by balancing the velocity (making it more uniform) From an airflow standpoint, they flow enough air to support 140-150 HP in stock form. West Coast Racing has 5. Power to keep the daily commutes fun and exciting. As you’d expect, Kingmaker is a truly epic game in both size and scope. 5:1 compression 446 c. So anything you can do to make that happen, will increase the horsepower and torque a bunch. The biggest gain was using long tube headers. I would either get a set of Ported stock heads , afr or even trickflow heads, custom grind cam, aftermarket intake manifold , full exhaust and go from there. 01 QS Z06, Coupe Performance ported 243 heads, FTI Street-Sweeper-HT cam, ported FAST 78, 1 3/4" longtubes, H-pipe w/ high-flow cats, B&B PRT catback, Vortex Rammer, ported throttle body, tuned by. Reuse Factory Intake Valves: 2. You could pretty much eat off it. Jeff Smith: We wrote about Vortec heads in 2016, and that article spawned this question. Peak torque was up slightly, from 485 lb-ft to 498 lb-ft, though at a slightly lower. Porting cylinder heads generally refers to the process of enlarging the intake and exhaust ports of an engines cylinder heads. Moes Performance Ported Throttle Body 87MM 2005-2012 Dodge Ram. When you grind this type of port, the centre of the port should be 4° to 5° higher than the ends. If you port the 351W head, it only gets better. couple of stones I could add 50 hp to and engine just by porting a stock head and that's no bull , I have a very good understanding of engines and what areas to modify for more power and what don't work. Unported LS9 Cylinder Heads. Couple that with the smaller ports' higher velocity (torque) and you get the best of both worlds, up to a certain point. Timeslips or dyno sheets would be great.