I believe .30 over but I'm not sure? I have a bunch of receipts that came with the car, the engine build was done by Wells Racing and Machine shop in Duncanville TX but the paperwork from them doesn't give much info. I was told Lunati cam 206/206, stock rods and crank. And I think JE pistons but i won't swear to it. Ported iron heads and ported matching intake.