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Super Stock Power: CFE Creates A Killer Set Of AMC Super Stock Heads

By Brian Wagner April 10, 2019Super Stock racing in the NHRA is a fascinating exercise in maximizing a combination inside a very tight box of rules. Rich Rinke knows a thing or two about Super Stock racing, so when his 1969 AMX needed a wicked induction system he turned to the team at CFE to help develop some cylinder heads. The final product of this project is a magnificent pair of heads that are on the cutting edge of cylinder head development and problem-solving.

Rinke is the owner of Turn-Key Automotive and it’s responsible for building all of the new generation COPO Camaros. The AMX that Rinke wanted to build his 340 horse/390 cubic-inch engine for is an original factory Super Stock racecar from AMC and one of only 53 built in 1969. These cars have a rich drag racing history so it makes the project even more interesting for all involved.

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For the possible AMC head castings that came on the engine, the NHRA requires factory stock volumes for head measurements. The intake port volume must be 205cc’s, the exhaust port volume needs to measure 77cc’s and the chamber volume needs to be 57cc’s. The valve diameters must be 2.080-inch on the intake side and 1.725-inch on the exhaust side.

Since there’s only so much you can change on a Super Stock engine due to the tight rules, engine builders have to get creative. Scott Kieffer from CFE explains why creating a high-horsepower AMC engine is a bit of a challenge.

“With decent cast iron OEM castings very difficult to find at this point in time, NHRA has approved certain modern aftermarket aluminum heads to be accepted replacements for Super Stock competition. In the case of the AMC, we were allowed to work with the INDY 401 SR heads which were ordered with no pushrod machining in the interest of giving us a little more latitude to design the ports.”