Would a thicker head gasket negate the milling(along with the compression gains? ) maybe pick up a bit of compression.
I’m considering buying a ser of rebuilt heads that have been milled already
If you mill the heads or the block or both, you'd need thinner gaskets. You can only get down to a .030 gasket, if you are lucky. Maybe only .045 if you are sort of lucky.
As you mill the heads or block or both, you make the heads closer together. So you either have to mill the face of the head or the intake manifold.
Either way, it's most likely it won't fit any other combination again.
