Small block Chevy heads have been manufactured sinceand have been used in high performance applications as soon as the first one rolled off the assembly line. Fifty-five years of manufacturing have left us with an endless number of different cylinder heads for the SBC engines. General Motors estimated that throughmore than 90 million small block Chevys have been produced, which means that there have been at least that same number of SBC cylinder heads produced.
Add in the amount of high performance heads that GM Performance Parts have sold over the counter and the number is astronomical. Vortec debate! Read on! The GM small block was specifically designed as a compact sized engine to embrace the economical use of iron and to streamline the production process.
List your World Sportsman II headed combo's and ET/HP #s
Part of the design process that was carried through to the Gen III design in was to create lightweight rocker arms for higher rpm operation, wedge combustion chambers for a broader power band, and deliver 4. Featuring the famous double hump marking on the ends of the heads, the and X heads used 1. The only difference between the two casting numbers was that the featured cc intake port, 62cc exhaust port and the X had the larger cc intake port, 64cc exhaust port.
The double hump heads continued to be a favorite with performance minded enthusiasts into the new millennium. High performance enthusiasts separated the stock Gen I heads into closed chamber and open chamber heads. By far, the closed chamber factory heads were favored over the open chamber for making power due to the poor burn characteristics and no swirl quench inside the combustion chamber of the open chamber heads.
Furthermore, the cylinder heads that were capable of making decent power were all manufactured when lead was prevalent in fuel and the valve seats stayed lubricated.Razer synapse 3
Unless you were using leaded racing gasoline, the valve seats needed to be replaced with hardened valve seat inserts. By the time a racer was done modifying the heads, there was substantial monetary resources invested in the cylinder heads and it was hard to justify the modifications unless you were running in a class that dictated hardened valve seats in a cast iron head.
Identified by Double Camel hump symbol. Identified by Camel hump symbol. No accessory mounting holes. Available on the LT1 engine and over the counter. Either straight or angled plugs.
Don McBride of McBride Performance Engine and Machining in Lake Elsinore, California, still prefers the old school cast heads because his shop specializes in building engines for circle track racing and desert racing. You have room to manipulate and improve the flow on these heads.
Of course we still have to build the engines according to the rules of the tracks that our customers are running at, and for the most part, the old style heads are what they are mandated to use by the rules. The newer style Vortec heads have a lot cleaner castings, however. Because of the extra metal, the old style heads seem to be less prone to heating problems, and circle track engines get pretty hot. The Phase II was the most popular for hot rodders and featured a cc intake port volume, and 64cc combustion chamber.
The biggest change GM made in the new design was revising the water jacket so the new Vortec heads could be used on conventionally cooled small blocks. The idea of using the LT1 cast iron head as a starting point for a new performance stock head came from the fact that it was the highest flowing LT head used by GM.
The cast iron Vortec head was in development six months longer than the aluminum head, and during that time, GM engineers tweaked the intake and exhaust ports for additional flow.
The cast iron Vortec heads was one of the first to purposely integrate tumble instead of large swirl numbers in the design. The newly redesigned Vortec cylinder heads were intended to replace the swirl-port Throttle Body Injection heads that were previously used on GM trucks.
What got the power merchants attention was the increase in horsepower from to solely based on the power generated by these heads. By the time you purchased a used double hump cylinder head and had it reworked, the cost was the same as buying a new Vortec head that produced more power.
Circle track racers were tossing their double hump heads as fast as they could buy the new Vortec heads. On the non-bow tie L31 Vortec heads, the ports are larger than the older cast steel heads, so they outflow the older heads. The L31 Vortec comes in two different casting numbers, or Apr 9, 1. Messages: 8, Likes Received: 1. Apr 9, 2. Messages: 3, Likes Received: I've heard some say they are not that great and to just buy some aluminum heads like AFRs or Canfields.
I use them and have made some serious power with them. Apr 9, 3. Those are engine dyno numbers of course. Heads are 72cc angle plug. Apr 9, 4. Messages: 18, Likes Received: Apr 9, 5. Apr 9, 6.
How Fuelie Cylinder Heads Launched SBC Performance
Messages: 2, Likes Received: 9. No clue on weight. Also rolled the car on that same pass. Car would have easily run mid to low 10's on motor and easy mid to low 9's on spray. Apr 9, 7. Thanks guys. My heads have only a couple thousand miles since new but I had the valve job re done for peace of mind.
They are totally as-cast though, no porting of any sort. Do you think this combo has any chance of running a Apr 10, 8. Messages: 7 Likes Received: 0. I had the same heads and cam with a Vic jr in my and it made hp and tq.
Got pretty close hp wise with ported heads on the I am in the process of installing now in my 79 4 speed Camaro.
GM Small-Block Cylinder Heads - Heating Up The Mouse
Apr 10, 9.I own and have used a set of Sportsman II's pocket ported for years now with decent power. Now I am rebuilding in search of more power! Or should I sell the heads and purchase some afr's Thank you. Naturally it will depend on the care and extent and skill of the guy doing most of the porting work, but in reality ID say its a lost cause trying to get those sportsman heads flowing the same numbers, UNLESS, your willing to spend big bucks on a skilled port job from the better head port shops with a flow bench.
I would not think twice about the option, Id sell those heads and get the AFR heads, but just some info, AFR has redesigned their cc heads to flow as well as their cccc heads and will supposedly have the newer style heads out for sale in the next days. New head is a whole different beast. They had a prototype there- very nice piece! Part number remains the same. Now the reason for delay is they are moving from their old shop and I mean old to a new location about 30 miles away".
And that they are based of a LS1 or LS7 head?? I can not remember exactly what the tech said?!?!? IMHO you can't compare the two. Sorta like apples and hand grenades. HAven't dynoed yet with this combo, but dynoed with P1SC, made hp 9psi rpm at the rear wheels.
That's when the belt started slipping. It was set up to run 14psi. We disconnected the blower and it still made at the rear wheels, I think around rpm. Those heads flow awsome. I had sportsman II's ported, on myran a best of Switched to AFR 's, same everything else, You can post now and register later.
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Click here to enter them directly into your cart.Vortec Heads - Horsepower Improvements
If you are an international customer who ships to a US address choose "United States delivery" and we will estimate your ship dates accordingly. If you are an international customer and would like to change the currency that prices are displayed in, you can do so here. Originally introduced inthe latest versions of these Sportsman II heads from World Products continue to be the industry's most popular cast iron cylinder heads.
Features include high-flow cc RightCast intake runners, Fast-Burn combustion chambers, and your choice of angled or straight spark plug locations. The ports are extra-thick with plenty of room for porting, and the heads are indexed off the chambers to ensure perfect alignment with the cylinders.
Other features include universal end pads that'll accept all early and late model accessories, leak-free machined valve cover rails, and the ability to accept both perimeter and center bolt style valve covers. They are available in bare or complete assemblies with stainless steel valves, valve springs, retainers, locks, umbrella-style valve seals, screw-in studs, and pushrod guideplates.
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Delivery Options If you are an international customer who ships to a US address choose "United States delivery" and we will estimate your ship dates accordingly. International delivery. United States delivery. Recent Vehicles. Refine results by: Current Vehicle Recent Vehicles. Recently Searched. Year Make CHEVROLET Model. Show Recent Vehicles. X Welcome International Customers! Results 1 - 14 of Even a stock engine that is used solely for daily transportation will typically enjoy the increase in power and improved drivability that is delivered by improving airflow through the cylinder head.
That brings us to the reason for this article. Just like any other question that pertains to your engine, it all depends on what you expect your engine to do. They come fully assembled, and feature 1. The Vortex head outflows stock non-Vortec heads, and according to Chevrolet, deliver a 20 to 40 horsepower increase over earlier cast-iron heads.
Before you can rebuild a cylinder head, you need to make sure it is even rebuildable. The discussion about rebuilding or buying new will never get a definitive final answer.
World Sportsman II Small Block Chevy Iron Heads, Angle Plug
Car guys are set in their ways, and since there are so many different opinions, we would not try to end the argument, but simply present some facts that apply to both sides of the discussion.
When having your heads rebuilt, consider the cost of replacing valve guides or liners, installing valve seats, and what kind of valve seals you want. There are two ways to accomplish rebuilding cylinder heads: Buy an already remanufactured cylinder head, or have it rebuilt by a local shop. While you might think the outcome will be the same, think again. When dealing with a supplier of ready-to-run remanufactured heads, keep in mind that the heads have come off of an assembly line-like situation.
Sometimes you can special order things that are done, but not always. They come with cc intake and 69 cc exhaust ports, and 2. They are also available with either a 64 of 72 cc chamber, as well as angled or straight spark plugs. When working with a local shop, your wallet is usually the limiting factor. The next thing to consider are the parts you choose when rebuilding the cylinder heads, as this can also have a huge effect on the end result.
Regardless of what parts you ultimately choose to include in your rebuild, there are certain aspects that must be addressed. Are the existing heads cracked or warped? Cast-Iron: Aerohead Racing.
These heads include premium one-piece, stainless steel, high-flow 1. Assembled with parts like heat treated and machined steel retainers and valve locks, seals, bronze wall valve guides, three-angle valve job, and heavy duty valve springs.
Must state cam lift when ordering head assemblies. When rebuilding a cylinder head, adding screw-in studs is an upgrade that will cost you more money. The previously mentioned machining processes are mandatory during a rebuild, but if you want to improve your cylinder head, you might want to consider some porting work.
The cost of rebuilding a set of cylinder heads with your local machinist can get very pricey, but there are times when the stock cylinder head is the only rational alternative.
They are for engines building less than horsepower and utilizing a rev limit of 5, rpm. The 1. The combustion chamber is available in either a 64 or 70 cc configuration, and come with 2.Count observations in r
The E-Street heads are not smog-legal, but the Edelbrock Performer heads are. While the previous outline of services does outline the approximate costs to rebuild a pair of used cylinder heads to factory specifications, sometimes, a performance cylinder head is needed.
Machining costs can add up when rebuilding cylinder heads.GM Performance Parts GMPPthe corporation's high-performance arm, has just released a new cylinder head that can add as much as 41 horsepower to the hp ZZ4 crate motor. In effect, GM engineers utilized what they learned from modifying GM's own cylinder heads and built the new heads accordingly.
Designed specifically for use with a flat-top piston, the Fast Burn heads can be decked down as much as 0. For less radical applications, GM recommends adjustment of the installed height of the piston to increase the static compression ratio, rather than decking the cylinder-head surface.
As the name implies, these heads are designed to burn fuel quickly and more efficiently via the increased cylinder pressures that they are capable of creating. Therefore, they derive more power per given quantity of fuel for better mileage and better power production. Using a taller head casting with a 0.
The intake ports incorporate runners with floors that are 0. Total intake-port volume is cc. On the exhaust side, the D-shaped ports have a volume of 78 cc. As an added benefit, water-jacketing volume has been increased for better cooling, something not possible with Bow Tie heads due to a lack of deck height and port-to-port casting material. According to GM, the 62cc combustion chambers are the most efficient ever incorporated in a GMPP cylinder head because the chamber is shaped for a cleaner flow through the gasket quench area.
Though the heads are fitted with 2. To test these new castings for ourselves, we enlisted Ken Duttweiler's ample dyno facility to run the baseline numbers. With the new heads in place and no other changes, the figures increased to hp at 5, rpm and lb-ft at 3, rpm. The bottom-end grunt was the most impressive as the torque curve remained essentially flat from 3, to 5, rpm.
In the four-speed Z28, in which this particular engine will ultimately reside, this kind of streetable torque is what gets things off the line in a hurry. While this cylinder-head swap is a worthy one, it carries a heavy price.
Is 40 more horsepower worth that much? Some people think so. Fast Burn Tech Notes: 78cc D-shaped exhaust port and runners provide excellent out-of-the-box flow.
In effect, the engine creates more power for a given quantity of fuel. Intake mating surfaces are drilled and tapped for GM Vortec and conventional raised-port intake manifolds.
Features taller-than-normal rocker-arm rails to provide better clearance for the rocker arm and valvetrain supports, as well as raising the valve-cover gasket height to lessen leakage potential. Cast porting allows for larger water jacketing and better cooling. Front head surfaces are drilled and tapped for typical accessory-drive bracketry. In addition, the heads are drilled and tapped for plug-wire retainers above the exhaust-port faces. Uses conventional rocker arms, valvetrain supports, and hardware.Rs siti khotijah
Equipped with lightweight, 2. The heads were equipped with 2. The Fast Burn heads used 2. Ed Taylor photographer Cam Benty writer. GM testing netted maximum total engine timing of 34 degrees. Accommodates 2. Share on Facebook Share on Twitter.Gain extra benefits by becoming a Supporting Member Click here find out how! Send Private Topic View Profile. Execution time: 0. All times are GMT Pacific.
Current time is PM Top. Attach Photos to Posts. Contact Us. My Cookies. Frequently Asked Questions. Forum Rules. I am currently running the Camel Hump heads with stock valves unported etc.
I am currently having some pinging problems and was wondering if the Sportsman II heads will help improve power at all. I currently have about compression with the 62 cc chambers.
They have lift springs, screw in studs w guide plates, 2. Also how much are these worth? You will loose a full point of compression but the improved flow of the sportsman heads will make up for that. It really boils down to the rest of the combonation. A real good price is around bucks if they are in great shape. Thanks guys. Also desktop dyno doesent show much of an improvement with the head swap.
Grumpy said it could very well make a huge improvement, you can take that one to the bank. Jeremy '94 Chevy K 5. Pray first before all else fails.How to control twitch recoil
The is in my blazer which I mud drag in a foot pit. I run this truck in low range which gives me a I don't make the rules, I just play the game!
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