I've got the original small block 350 in the vehecle with the factory heads. i'm trying to find out if there is a way to figure out what my cylinder head combustion chamber cc is without having to remove the heads. i need this information so that i can order a set of pistons that will have my desired compression ratio. i would really appreciate any help i can get because the people that i have spoken with are telling me that i'm gonna have to pull the heads and do a fluid test. i've sot no problems doing this if it is completely necessary but if there is any way of obtaining the info and still being accurate i'd like to atleast try it so i can keep my car on the road while i'm waiting for the parts to arrive.