Ok heres my problem i have a 383 that i am ready to build. It has 11:1 domed pistons w/ 64cc heads ok? now I have a pair of 60cc heads and a pair of 75cc heads what should I do, mill the 75cc heads down to 64? or could I use a thicker head gasket remove some material from the chamber and a little off the pistons and I mean a little. to get to 64cc's Im a little tight on money right now, any info would be a big help thanks. Johnny

 

Well if money is tight you could try the 70cc's with a thick head gasket (find out its compressed thickness and do the calculations to find the comp raito) Machine work is always going to cost a bit and if you get the heads milled down to 64cc, you'll need to get the intake milled to match up again.