Forsale are a set of GM Performance ZZ502 big block Chevy aluminum heads. Casting number is 12363391. The part number is 19418910. These heads are large oval ports. They are fresh from the machine shop. They have 2.25/1.88 valves and are 110cc. The intake runners are 290. The valve springs have been upgraded to Howards Cams springs. They can handle up to a 670 lift hydraulic roller cam. These heads will wake up any 396-502 bbc engine. New with spring upgrade these heads are about $3800. Price is $2800. Call 334-405-8212.
