Compression and Cam selection

plumkrazee70 said
If the piston is .018 out the hole it's open for that reason? They are only 2 cc different between the two part numbers.

Because it's a bad design. It's not about the cc's.

You set quench with a gasket, simple and easy. Those chambers, are not consistent. .018 out of the hole, put a .055-.060 gasket on it.

Your car, your stuff. As I say, pick your parts, pay your money.