I am about to buy a set of world product heads for my SBC, and have a quick question. Right now I have stock heads (76cc) and I am going to a 64cc head. The pistons are stock style dished/forged pistons. What should the new compression ratio be (approx).

Tech Inspector- Is this going to hurt the fact that I just bought that cam you recommended, it was CRN-100172. I thought that you said the duration was low to compensate for the lower compression.