Alum. head combustion Chamber cc\'s? Someone told me that all factory and most aftermarket aluminum heads have a combustion chamber of 64cc, is this true? I am buying a friends truck and it has a set of Trick Flow heads on it that have been shaved. THis raised the comp ratio up and now should have race fuel run through it. He told me that he was going to run some thick copper head gaskets, but have been told they leak. I am not sure on the pistons f they are dished, flat or domed, but can find out.... What I am wanting to do is get the compression ratio down to a pump gas size for a DD. He has been running it with pump gas an retarded timing and he said it runs fine, but to run at normal timing it needs race fuel. The engine is an 89 350 block with a 383 Scat Crank, KB pistons, Trick Flow heads and I am not sure on the Cam and Rods.... Anyone? Thanks!!!