1971 Oldsmobile 442 Increasing compression ratio

shave the head will increase it by a few points or get different pistons.

To Beef it up some you can have the heads milled. that is take a little off the head increasing the compression. you want more have the cyclinder walls shaved, but go as little as possible Seen some with walls oversized to 60,over stock. ..you can get a set of domed pistons. that would increase cylinder pressure