On the dyno, a 600-hp big-block is rewarded with about a 10-hp increase. This engine made 598 ft-lbs and 599 hp using a COS-Cam (computer optimized spec) 268-degree cam with 219 degrees duration at 0. Actually all things were not equal. CHEVROLET 7.4L/454 Airflow Research (AFR) Cylinder Heads - Aluminum Cylinder Head Material - Free Shipping on Orders Over $99 at Summit Racing. This cam is suitable on 496 bbc engines or larger. We use them on every set of BBC heads we install on our engines, including the Dart Platinum Pro-1's, and AFR heads. At 6, 000 rpm, the AFR heads posted a staggering 130-hp gain! This test demonstrates the effect an increase in low-lift flow has as long as it is not compromised by incorrect valve event timing. It shows how to build a really effective bench for about $150 in addition to the cost of a pair of stout vacuum cleaners.
I have also used both of the CNC 335- and 355-cc runners. This is one of the chambers of a set of 335-cc oval-port Brodix heads reconditioned by Mark Dalquist of Throttle's Performance. However, I did help build a 712-ci engine using a set of out-of-the-box Pro-Filer Hitman 12-degree heads. "Slick Rick" of Slick Rick Racing heads in Magnolia, Texas, designed these heads, and they look as if they pack a lot of potential so be sure to at least check them out. Afr heads big block chevy. Please call for availability on your head! The rocker tip may end up offset to one side more than is acceptable when using fixed guide plates, and the Dart adjustable guide plates allow a decent amount of correction.
We have looked at several others on the market, and still find many issues with them that are not acceptable. I have to say that AFR's rectangular-port heads are among my favorites to use either "as cast" or on which to conduct a simple porting exercise. For those running the smaller bbc engines or lower than normal compression ratio, we recommend our cam one size down for improved low end response. Terry Walters built the 565 at his shop, and the owner was okay with it being used as a dyno mule. We offer high quality USA made, Howards brand pushrods made from 4310 chromoly. Although it seems a logical way to view the situation, overly large is in fact the wrong way. The mixture is set a couple of numbers too rich. Afr big block chevy cylinder heads. For a comprehensive guide on this entire subject you can visit this link: SHARE THIS ARTICLE: Please feel free to share this article on Facebook, in Forums, or with any Clubs you participate in. Throughout the book I refer to cylinder heads that directly replace stock heads at 24 degrees.
They come standard with stainless steel 2. We have sold many engines with these heads. Afr big block chevy oval port heads. In fact, these results were so strong that even Darin Morgan, with all his experience with high-output engines, was very impressed. 700, the flow remained unchanged. Last but not least will be the low cost Quickfuel Brawler carb. I've used a number of BMP 24-degree heads from late 2010 on but I have never actually done any definitive dyno tests. I helped out with the initial builds that used E-Street heads, but these builds did not go on the dyno.
The castings are then machined in the United States. Zero failures in the casting, zero failures in the seats and guides. The list of relevant subjects includes port shapes (oval or rectangle) and port volume. AFR Big Block Chevy Heads. This has a radius lower cut, which, with a 2. Offers a variety of Big Block Chevrolet Valve Cover Gaskets from the biggest brands in drag racing including Brodix Big Block Chevrolet Valve Cover Gaskets, Dart Big Block Details ». Push Rod length: Pushrod length must be determined with a pushrod length checking device. The competition series are made from a much higher temp alloy than most other stainless valves.
Guide plate recommendation. See details below about our hardware and assembly procedure. Compression ratio remained the same. The low cost imported rocker arm studs have shown numerous problems unlike those in the past. Pictured below are the AFR 335 heads in bare form to give you a view of them without the hardware from a different angle. We know the heads and cam are capable of producing more power had this particular engine had a bit more compression.
The heads used may have some variances. Determining port volume is critical, so you need to know when big is just too big, matching flow curves and port volume to cam lift, and finally the compression ratio. I have run all of these heads at one time or another, and they all produce stout performance right out of the box. These heads seem to be a combination of offshore and U. S. manufacture. Showing all 3 results. In terms of bang-for-the-buck porting, stock heads are the cheapest way to go. The intake ports started out at 318 cc on the Speier modified 088 factory casting, and the porting process increased the volume by only 10 to 12 cc. On a properly set up engine, these heads have good detonation resistance so a 10. The guide boss in the exhaust port has had a rework, and the remainder of the port has been cleaned up, which works okay up to about 0.
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