ive been trying to find some kind of calculater or chart or something that can help me figure this up i dont even know if there is such a thing but im just curious as to what compression ill be running...

my set up is a callies stroker 4" stroke w/ 4.005 bore making it a 403 with SRP flattop pistons with a CR of 11.3 with a cylinder head with 66cc

now my question.. im putting my stock 241 heads back on this thing for now and im pretty sure their a 66cc so that puts me at 11.3, now im going to mill them .020 that should bump it up also correct? im trying to figure out how much or if its even that big of a number to notice?

 

If the 241's are at 66cc currently milling .020 will take them down to about 63cc. Rule of thumb is .006-.007 per CC on these heads.

 

ok great thank you that answers my question