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