Too many unknown variables to give you a solid answer to that. You need to know the bore diameter, how far down or how far up the pistons are in the hole, what the CC's of the chambers are of the different heads, gasket thickness, gasket bore diameter, and CC volume of valve reliefs are. You know all that then you can plug those numbers into a comp ratio caluculator which you can find a Keith Black's website and find out for sure.