Porting Cast Iron Heads

These are available from GM dealers in the USA for US $408 a pair, fully assembled. These Dart Iron Eagle heads will give you the performance you want at a great price. 25" intake/1. Cylinder Heads. 5 not bad for a dish. would be true. 15° DART SMALL BLOCK CHEVY HEADS. At the end of the day, it isn't logical to spend $500 for someone to port these iron heads for a measly 30HP. Raised intake port design radically improves “as cast” flow up to 40% over standard heads. If you have any SBF flow data please send a copy to Tom Rauch 371 Dean Rd. But, Horsepower has a much cheaper means to the same end. In fact, the head carries the 360 J casting number. Features may include: THROWBACK STYLING. always had good luck with the log type. Please specify block type: 302 uses 7/16" head bolts or 351W uses 1/2" head bolts. Currently In Stock: * Please call for current stock. 650”lift, with 300cfm at. 5 externally threaded shaft, 2 7/16in. 7,000+ RPM, 400+ cubic inch engines. 5L "HSC" (high swirl combustion) cast iron heads, General Motor's 2. Obviously, the modern heads flow more air than the vintage, cast-iron, small-block heads. Porting, especially on the exhaust side is recommended. The Iron Eagle is available with either a high-velocity 308cc intake runner that produces incredible torque or a 345cc version that's perfect for big-inch, high. A new high velocity oval port design makes this head an ideal choice for street cars and trucks. The cast iron Vortec head was in development six months longer than the aluminum head. clean-looking installation. Factory Big-Block Cylinder Heads Oldsmobile factory-production big-block cylinder heads are identified by a letter cast into the front lower portion of the head on the number-1 and number-8 cylinders. I had them ported and polished and I love them. I do have a weldcraft water cooled bendy torch that's straight, but it's no smaller around than the #20 with the gasket under the cup, so it won't help in this case. these list at Jegs for $2685. The aluminum L98 heads (113 casting) are equal to the iron L98 heads on the int, and much better on the exh side, and slightly better than the 193 exh as well. Rose hand pump - Base. These burs are for those jobs when you need a little extra reach. During the cast-iron head drought, the aluminum heads were the only choice. After our SST Porting, the heads will flow in the 300 cfm range on the intake and 195 on the exhaust. Aluminum On the subject of drag race cylinder heads, there’s considerable debate over which material—aluminum or cast iron—provides the ultimate power advantage. Aluminum heads are a better investment. Cylinder Heads. The M/W heads (P/N HUG 4950) can be supplied with 3 different port types and sizes. As with most Ford heads, the intake port is plenty generous if not a little on the large side. You may find good deals on Trick Flow high port cast iron heads, most being sold by guys who are looking for weight reduction. We're currently testing the unported iron. Cylinder Heads - High Performance Heads, Racing Heads, Aluminum & Cast Iron. Our selection of cylinder heads will cover nearly every engine build requirement from 300 horsepower street engines to full CNC ported aluminum head that will support 2000 plus horsepower. This is getting the most I possibly can get out your heads. European sailboats, British war ships and Civil War vessels are. Ideal for cast iron or aluminum heads and intake manifolds. it said that from the factory, the standered log style manifolds are the best, but after they get done altering them, the centerdump style were better. Why buy a set of heads with the wrong parts when we can build you a custom ported set of heads complete, ready to bolt on with the right parts. After our SST Porting, the heads will flow in the 300 cfm range on the intake and 195 on the exhaust. The porting, though, is about as simple as it gets and speed of porting cast iron is, in this case, partly made up for by the minimal amount of metal removal. 185 bore custom je piston dish to keep comp low with 50 cc heads comp roller W9 heads being ported by Ryan as we speak jesel 1. After years of extensive R&D both on the flow bench and on our track, we have developed some of the best performing round port and D-port cast iron Pontiac cylinder heads ever. The air gap on a mild ported head took nearly 14% off the flow, where a R4B was 8% and a stock cast iron was 9. Every now and then you have a good day and you are lulled into thinking it's not so bad. Cylinder heads need to be pressure-checked using an application-specific machine. Porting available. the AFR185s are also good heads, and a good low cost aluminum head. A bare cast iron 781 casting - no valves, springs, retainers, pushrod guideplates etc. CNC Porting - Occasionally a 100% CNC ported head might have a very small area left "as cast", this in no way affects performance. ) but this one was the first in a long time that retained the 1970's era OEM cast iron 4V heads. Find FORD 4. But welding cast iron is kind of like playing golf. Pro Filer Sniper Big Block Chevy Heads with 290cc Intake Runner, 2. 600", Stage 3 Assembled, Pair *Assembled by Competition Products: In Stock. MPS PERFORMANCE CYLINDER HEADS. Level 2 porting features a reworked short turn, chamber deshroud, bowl blend, a blending of the valve guide, and the pushrod pinch is reduced. In order to get the latest information please check out all of the porting guides and the information contained in them. Air Flow Detail #222 All American SBF Head - 205cc Runner. 88 exhaust. 600" The exhaust port is probably the Iron head greatest weakness. Add stage 1 porting add $350 Add valve train setup for hyd roller or solid flat tappet $250 OEM iron heads completely rebuilt Closed chamber 72-76cc D0VE or C8VE type Bowl blend porting flow 25cfm over stock Assembled with Stainless 2. Feel the purity of two wheels, a handle bar and an engine. 00* Bulletproof Aluminum rods for the B engine, made of 7075 T-6 aircraft alloy, machined to except the Triumph TR-4 insert bearings. The base 440 EZ-1 is the same as 440 EZ head only with a CNC M/W port opening. These value-priced cast-iron cylinder heads use modified combustion chambers and high-velocity port technology to provide improved performance. UnderCover cast iron cylinder head modification, acid porting vortec cylinder heads & manifolds. Heads (46-221) • Must be Used with 390 Carburetor • Uses FP 1206 or CO C5416: HV 1011: 5. Many other heads in stock as well as manifolds and rocker set-ups Rectangular Port Cast Iron 1. Click here for more details. has the market covered with 180cc intake runners, plus the 64cc exhausts ports are substantially larger than OEM Ford. ) Heads can be ported. Dart Machinery, LTD. If a vehicle was ordered with as “high-performance” with a big block, that engine received rectangular-port heads. Also they cast them with huge/restrictive guide bosses (Stage VI and iron R/T Magnum heads, in particular) and weird ports (aluminum Magnum/Commando intake and exhaust), but when ported/cleaned-up, the other superior features gave them an advantage. The information contained in the porting guides is evolutionary and is posted as I learn about these castings. If that's a heads up race engine or your standard street rebuild, we take it to the max. We start with a raw as cast KRE D-port head and CNC port it to flow 290-295cfm @. Re: CYLINDER HEAD INFO gathered by DJOHAGIN Admin on August 6th 2009, 2:28 pm Set #3 was a set of new C-460 heads that we did for a street driven turbocharged engine. Sign up for new product releases, updates and sales. The dual plane intake has a longer runner length and will make more torque for your combination. The same port profile can be ­replicated with a new casting. 650” lift • Recommended 10 degree locks for solid or roller cam • Customer must supply cam specs. from your local speed equipment shop or MPG Heads. 550), 10 O titanium retainers & steel billet locks, positive Viton valve seals, no studs or guide plates but. The 406/427 High Performance cast iron exhaust header is a terrific manifold for stock installations. No porting was done at all. World Products offers. But, Horsepower has a much cheaper means to the same end. Other porting packages are in the works. The CJ heads can have both BBF or BBC exhaust flange. Heads (46-221) • Must be Used with 390 Carburetor • Uses FP 1206 or CO C5416: HV 1011: 5. Heads, solid flat tappet, hyd. Flow data listed on the www. They are still generally inferior to a good aftermarket aluminum manifold in terms of power (some much more than others), and impose a considerable weight. Cast iron cylinder head for circle track & nostalgia drag racing applications. 600", Stage 3 Assembled, Pair *Assembled by Competition Products: In Stock. Aluminum castings lend themselves to low-volume production, so these may be made in batch runs of 100, 500, and 1,000. I'll be showing them at the PRI show. Sort by: CNC ported 217cc Dart Iron Eagle Platinum Cylinder head. Chrysler Automotive Cylinder Heads Remanufactured & New Cylinder Heads for Chrysler You may browse the list of Chrysler cylinder heads below or use the search form below to find the cylinder head for your specific Chrysler vehicle. They appear to be older Dart SS castings since they have the 007 casting number still on them. About Us Midwest Cylinder Head and Machine started as Williams Cylinder Head in 1946 in Ames, Iowa. Guides: 11/32" valve guides are standard, 5/16" guides are available upon request. (oval port) I am trying to get some answers/opinion on something i am investigating on BBC Cylinder Heads. There were a number of crossflow heads made Oz, in both aluminium and cast iron. Change Over Cylinder Heads. teflon seals Stainless steel Ferrea valves 2. Special edge prep and abrasive intended to use on cast iron cylinder heads with steel pre-cups. I have 2 Sets of the Cast Iron. Bear Block Motors (BBM) is proud to introduce the incredible new BBM FE cylinder head for 390, 427, and 428 big-blocks with 2. Imagine that you could get the advanced features of Dart's championship-winning aluminum big block heads in a cast-iron version. That core shift ALWAYS reduces the air flow in the port. SVO N352 “Cast Iron” F8117xx High Port 192 (Use diagonal pattern on head) F870xx F871xx F8134xx. TPV Productions 151,459 views. [If you're running cast iron heads, I would think the molten aluminum idea might not be a good call, due to the differences in the expansion rates of cast iron and aluminum. The line is dedicated to changing the 23º SBC market as we know it. Butler Performance is the main source for stock and performance cylinder heads for your Pontiac. While some cylinder heads are cast with improved ports and runners, we also offer CNC ported heads for the most precise and even flow into and out of each cylinder and the desired surface. At that time, nearly everything was cast iron and if you did have enough money to purchase one of the few aluminum heads available, they were in raw form. Stage Port work on factory Oldsmobile Cast Iron Heads J&S Machine is dedicated to transforming Stock OLDS Heads to a FORCE to be reckoned with. See pictures on gaskets traced on intake ports above. Ideal for cast iron or aluminum heads and intake manifolds. pair of bbc dart 18 degree cnc'd rectange port big chief heads/titanium retainers,2. The same port profile can be ­replicated with a new casting. Tuck and roll seat. 28" Intake Valve and 1. The RHS® Pro Elite™ series of CNC-ported cylinder heads is designed for racers who want the absolute maximum engine performance. (oval port) I am trying to get some answers/opinion on something i am investigating on BBC Cylinder Heads. Cylinder head porting isn't what it used to be. CYLINDER HEAD PORTING TOOLS. The ProKing head is capable of 1000 naturally aspirated horsepower on a 400 c. One of the ways we repair cylinder heads is by Machining out all of the original crack and then welding it back up with new material. TFS Highport. They feature thick port walls (extra meat for porting!), enlarged water passages, multi-angle intake valve seats, hardened and radiused exhaust valve seats, bronze valve guides, and heart-shaped 64cc or 72cc combustion chambers. Windsor Jr. The information contained in the porting guides is evolutionary and is posted as I learn about these castings. , World, Windsor Jr. Scrub the cylinder heads with a scrub brush and solvent. Many cylinder head manufacturers mentioned that engine builders should beware of budget cylinder heads available on eBay and through other sources. Any of the entry-level aftermarket Pontiac V-8 cast-aluminum cylinder heads flow nearly as much in as-cast condition and are ready to run, and can easily flow substantially more than a max-ported cast-iron D-port for a reasonable cost. Porting these E7 heads, even an A job, may yield a 30HP gain. Finish up with sanding rolls after cleaning the wax from the port. Slide both bolt heads into the fence’s T-slot to attach to fence. I was thinking of putting a steel sheet metal screw in it from the freeze out plug side and then mig welding it with some. pair of bbc dart 18 degree cnc'd rectange port big chief heads/titanium retainers,2. Requires W2 Shaft stands and offset rocker arms Machined for 2. It all depends on your goals. BBC 454 to 470 CID with AFR 265 or 290 Oval Port heads to max of 6200 rpm. -Both heads remained the same until Summit purchased TFS. Porting Option: The heads were cast to flow a lot better than the stock heads, but we do offer Stage 2 porting which will increase the flow even more. Once the engine is up to temp, there is no difference. Must use inline valve style piston or High Port specific pistons. The largest growing portion of the small-block Chevy head market has to be the 200-cc and larger intake port volume segment. They come with hardened steel seats, and bronze alloy guides. We take a very serious and methodical approach to cylinder head porting. The CJ heads can have both BBF or BBC exhaust flange. ) Heads can be ported. 880'' (11/32'') Valves World Products Big Block Chevy Merlin III Cast Iron Cylinder HeadsAssembled w/1. Specializing in High Performance V8 Street & Race Engines. -The 3rd generation aluminum head was a permanent mold tooling based off of the iron head. We recommend that if. Racing Head Service’s LS Race Block is somewhat of a deceptive name since it is easily as at home on the street as it is on the track. Other porting packages are in the works. 00 will out perform "any" cast Iron BBC heads on the market. -Both heads remained the same until Summit purchased TFS. Trick Flow Specialties is a leading designer and manufacturer of high performance cylinder heads, intake manifolds, and engine components. A couple of mates of mine,runs 2V closed chamber heads on there 351's. Over the years I have had mixed results welding cast iron with nickel. New high performance aluminum cylinder heads make great power. Head porting is also designed to each application, so we don't port a street motor the same as a full out drag motor. The thick deck surface also improves head gasket retention in boosted and nitrous applications. TRUCK FREIGHT APPLIES TO THIS ITEM. 60 Exhaust valve and they are set up for a flat tappet hydraulic cam. A new ABS (anti-lock brake system) was standard, this prevented wheel lockup during heavy braking. It easily withstands today’s high horsepower loads with unsur passed reliability. Flow data based on Cylinder #1 intake and exhaust port. It also offers a. world products windsor jr heads in cast iron are inexpensive and bolt on about 50hp. Also large intake ports for high flow. new aftermarket cast iron gm chevy performance 302-350 906 vortec cylinder heads. Bob, Jeff's brother, is now running Modern Cylinder Head. Speedmaster offers a wide variety of aluminum and cast iron cylinder heads for both race and mild street applications. I'll be showing them at the PRI show. Mark tells us the humble 289 C5AE cylinder-head casting with its 53-57cc chambers makes an excellent factory iron casting for port work. I purchased a new set of the old style shelby cast iron headers and ported them to match the heads. Though the heads featured as-cast ports and chambers, the intake port did receive a minor port match. This BurCam Cast Iron Grinder Pump is ideal for residential sewage applications, lift stations and light commercial applications. 0L V-8 L96 is a heavy-duty workhorse engine. A slightly larger. A new center brake light was added above the hatch to comply with new safety laws. I have no hands-on porting experience, but, will add, port matching intake to heads is a "good thing" with benefits in performance. Cast-Iron Intake Manifold Improvements Almost all Mopar engines were equipped with cast-iron intake manifolds, some of the obvious exceptions being some 6 Pack, Max Wedge and Hemi engines. If you don't want a burr finished manifold proven from many dyno sessions, back to back runs, and track times, please don't order one from SRH. When aluminum heads are cast there is a lot of core shift, more than with iron heads. Barnesville, GA 30204. Porting of a cylinder head returns the most bang for the buck, especially if the camshaft and intake manifold are also changed. World identifies Windsor head casting numbers as "I-051" for cast-iron models and "I-034 for aluminum models. 600" Angle Plug, Bare Castings The first available true aftermarket performance cylinder head, good for 30-70HP over stock, and emissions legal!. This comes in 2 parts. Alumin heads are lighter. (MCH) founded in 1996 by Jeff Kobylski. How much does a cylinder head weight on a and then by myself without the head and did the math. Aluminum heads conduct and carry heat better than iron heads. Why buy a set of heads with the wrong parts when we can build you a custom ported set of heads complete, ready to bolt on with the right parts. Heads were bought new and used by me for a very short time and have been taking up space in my shop. That is the port cc required for a 24 degree head. 900"exhaust valves. If a vehicle was ordered with as “high-performance” with a big block, that engine received rectangular-port heads. engines Engineers at RHS® have recently designed the only Small Block Chevy 23-degree cast iron head for 360-434c. Today machinists can easily improve on any stock iron Pontiac head with the inclusion of hardened seats, screw-in studs, longer valves, taller installed height for after market springs working with high lift camshafts. 94 Intake valve and 1. Intake flow as much as 448 cfm @28" H2O!! Please call Joe @ (865) 573-9151 for more information. Aluminum On the subject of drag race cylinder heads, there's considerable debate over which material—aluminum or cast iron—provides the ultimate power advantage. 400"intake valves,1. To get some perspective on head porting, we turned to Gavin Knisely. aluminum vs. Install fence hang hooks. One of the ways we repair cylinder heads is by Machining out all of the original crack and then welding it back up with new material. The Impy iron heads weigh more obviously, allow less timing, and are lower comrpression (even with a. Please specify block type: 302 uses 7/16" head bolts or 351W uses 1/2" head bolts. The QP1000 is a cast iron performance header set for small block Chevrolet engines that are installed in a variety of classic and street rod applications. RHS Cast Iron; Big Block Ford. 880" exhaust valve job. And cast iron is easier to port/machine than aluminum, well the porting is easier and milling is about the same. roller or solid roller cam. SVO N352 “Cast Iron” F8117xx High Port 192 (Use diagonal pattern on head) F870xx F871xx F8134xx. Do not clearance the push rod area as the wall is. Regardless of what your final destination is when you build your high performance engine, eventually you will have to deal with the cylinder heads. Porting and Polishing Tools for Professionals! Please go to our Web Store at www. 60 add $100. Re: Repairing a small hole in an intake port of a cast iron head Z-spar Splash Zone is the most commonly used one that I know of for reshaping intake ports. WOODWARD EQUIPMENT CHS 15790 SE Piazza Ave STE104 PO Box 2650 Clackamas, OR 97015 USA. 650”lift, with 300cfm at. Stainless steel replacement valves are allowed. We can modify your heads or supply new aftermarket castings bare or complete. 150 mph on the dyno with over 250 hp to the rear wheels!. Maskin says more than 25,000 iron heads were sold last year. Denny rebuilt the engine and ported and polished the cast iron heads. The same port profile can be ­replicated with a new casting. One of the most important components to an engine's performance is cylinder heads. We are #1 in Cylinder Heads since 1980. You may want to have a Reputable Radiator Shop perform a Coolant Pressure Test to Pinpoint & give you an Opinion on the exact Leak. This is a ported pair of “as-cast” 325-cc port AFR heads. Heads (714)943-3404. If you need the head ported just do it and be done with it. cast iron v/6 heads are bi-directional. 0 Ford Mustang with OEM cast iron heads, these cylinder heads can be modified to make over 500 hp with hand porting in our engine shop, but when treated as a street performance head, can give a quick 100 hp with an enormous amount of acceleration, which is what a street performance engine must have. To find out exactly how much more, we went to noted Ford engine specialists Powered By Ford in Orlando to. 650” lift • Recommended 10 degree locks for solid or roller cam • Customer must supply cam specs. This intake has been welded in the corners to allow further porting. Cylinder heads are made from either cast iron or cast aluminium. World Products 030630 - Cylinder Heads Cast Iron Chevy Big Block MERLIN 345cc Rectangle Port 350cc 119cc 26Degree 2. Includes the following:. Same Info applies to the: 4. The Pro-Filer All American CNC ported SBC cylinder head has the same outstanding features as our "As-Cast" SBC heads. For a step up you may want to consider one of the following heads, all found at Jeg's: Roush 200 cast iron: 200cc intake, 64cc combustion chamber, 2. High performance cast iron cylinder heads are a vast improvement over factory castings at a highly affordable price. I bought these to port a set of chevy cast iron heads. The remainder, 6 to 20 were cast in aluminum by Bill Fisher. How much does a cylinder head weight on a and then by myself without the head and did the math. The CJ heads can have both BBF or BBC exhaust flange. There are d-port heads and round port heads. And cast iron is easier to port/machine than aluminum, well the porting is easier and milling is about the same. During the cast-iron head drought, the aluminum heads were the only choice. You dont want to be porting while trying to balance the head on a flimsy work surface. 6L heads, are notorious for cracking. The intakes designed for the W9 heads were designed to work with this head (or the bigger CNC-ported versions) and were leading-edge technology at the time. World Products 053030 - Cylinder Heads Cast Iron Ford Small Block WINDSOR JR. Legal for 1994 and older emissions controlled vehicles under CARB EO #D-250- 2. 180cc 58cc 20Degree 1. These Dart Iron Eagle heads will give you the performance you want at a great price. Aluminum heads are hard to beat when it comes to performance, but cast-iron heads are still a viable option for restoration or certain performance needs. DIY Head Porting Small Block Chevy Vortec 062 Part 1 of 3 - Duration: 17:08. There are many things to look at in a 2 barrel application that will kill power. Fully CNC ported. Aluminum On the subject of drag race cylinder heads, there’s considerable debate over which material—aluminum or cast iron—provides the ultimate power advantage. Brand New Cast Duramax Cylinder Heads From Wagler Competition. Since 1987 the original small block Ford performance cylinder head. OEM Cast Iron Heads only (See list of approved head castings. Webstats Analysis for Castheads -castheads. Next they are checked by magnafluxing, (cast iron only) or pressure testing. Apply it to the intake gasket surface around the intake ports and allow it to dry. You can check out the article HERE. Cast iron cylinder head for circle track & nostalgia drag racing applications. Porting of a cylinder head returns the most bang for the buck, especially if the camshaft and intake manifold are also changed. 60-inch exhaust valve with a radiused valve seat. Back To Front Page - Contact Info - Secure Ordering. Sort by: CNC ported 217cc Dart Iron Eagle Platinum Cylinder head. $265 Performance Valve Job Machine your head's valve seats with a top of the line Sunnen VGS-20 seat and guide machine for either your stock or oversized valves with our flow bench developed seat cutters. When it comes to high performance replacements for factory cast iron heads, World’s WINDSOR SR. There's a group of yet-to-learn dudes that argue that cast iron heads. In terms of compression you will have to raise comp to get on equal footing as cast iron as there is only a few cc difference in combustion chambers. How to get a few extra horsepower for free when rebuilding and engine. [If you're running cast iron heads, I would think the molten aluminum idea might not be a good call, due to the differences in the expansion rates of cast iron and aluminum. Bronze is excellant in aluminum heads where heat transfer is high but can be a problem in an iron head. Vortec Bowtie Cylinder Head Technical Notes: • Cast-iron Large Runner Cylinder Head • 66cc combustion chambers • 0. AFR's 195cc "Street" heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. I do have the Stock port size manifold set up, from A&A, along with the cast iron exhaust manifolds. world products windsor jr heads in cast iron are inexpensive and bolt on about 50hp. I also used the intake gaskets, locators, and port -matched the intake to the cylinder heads. 5 externally threaded shaft, 2 7/16in. How to Port & Polish Cylinder Heads. As you can see they flow very well and they have incredible intake port speed. now there is no question you would have a good bit of money into a full ported set of cast iron heads but it should still be less than edelbrocks from the standpoint of difference between aluminum and iron heads, it would be torque, since the amount of torque. Each component undergoes a detailed manufacturing process that involves the hundreds of calculated and precision steps to ensure the finest quality possible. 510-inch exhaust valve lift. IMO this is about as far as they will go. The head itself should be level, stable, and angled such that you can look directly down the ports as you grind. The Innovative 3V 185 is in a class of its own amongst Cleveland Cylinder Heads. One of the most important components to an engine's performance is cylinder heads. cast iron v/6 heads are bi-directional. When this new cylinder-head design was established, Chevrolet then decided to create two distinct versions of the cylinder head. **Can hot tank/machine clean like in last photo for an additional $150** We have hundreds of bare cylinder heads available for purchase. did you know there are twelve dif. A rebuilt set of iron heads even with pocket porting shouldn't run as much as new aluminum heads. The output oil to the filter and the return oil from the filter are separated from each other by a pressed-in plug, PN 3462871. Flow data based on Cylinder #1 intake and exhaust port. On the dyno the power curve was like a square wave; straight up and then horizontal forever. The stinger goes into the exhaust port toward the floor of the port. "Fast One" is our resident Factory Iron head expert, and he has gotten over 280 cfm out of a fully ported Iron head. ) but this one was the first in a long time that retained the 1970's era OEM cast iron 4V heads. In order to get the latest information please check out all of the porting guides and the information contained in them. This cast-iron head is called the peanut port because the intake ports are not much larger than their namesake. The heads flow up to 300 CFM on the intake (factory is 160 CFM) and 260 CFM on the exhaust (factory is 140 CFM). For cast-iron heads, a fine-tooth cutter removes metal faster and produces a finer finish. (Also, as an aside, many manufacturers are going to ductile iron for cast heads, not cast iron. They are cheaper for additional porting if you ever want, they are easier to repair, lighter, and you can run more compression without detonation. Cylinder Head Flow Data @ 28 Inches of Water. I do have the Stock port size manifold set up, from A&A, along with the cast iron exhaust manifolds. Combustion chambers are 69cc with 228cc intake and 82cc exhaust runners. We back up our head porting with flow numbers from a Super Flow 600 flow bench. RHS Cast Iron; Big Block Ford. The 406/427 High Performance cast iron exhaust header is a terrific manifold for stock installations. Extreme Port Job for Cylinder Heads:$1500 for aluminum. Instantly the HP rating increased 55HP to 255 HP primarily from the power of these cylinder heads. World Products 011150 - Cylinder Heads Cast Iron Chevy Small Block SPORTSMAN II 200cc 64cc 23Degree 2. Just a thought] Buzzman72void where prohibited, your mileage may vary, objects in mirror may be closer than they appear, and alcohol may intensify any side effects. For around $1,200, you can improve airflow, raise compression, and boost power with a pair of Performer RPM heads. The largest growing portion of the small-block Chevy head market has to be the 200-cc and larger intake port volume segment. These are the worlds only aftermarket cast iron Cleveland cylinder heads.