[pontiacmark]

Originally Posted by steve25

A 1/10” dome will not be a problem in terms of clearance, but with the 96 to 98 CC volume of those 1971 heads compression will be a problem.

Since you need to find out the CC volume just oil up the piston top.
Pack clay on it to form the dome shape, then peel it off and CC that.

You should easily be within 2 CCs of being correct which will then mean being well within 1/4 point of knowing the actual compression..

It’s very strange to me that someone would spend the money on custom pistons only to plop on a set of crap heads that do not have a full length divider in those center exh ports , which I believe is the way those heads are?

Strange to me too. Even if it's net zero Cc with the valve reliefs, it will be over 10:1 with 96cc heads. If he mills the domes off, still will have to rebalance. Might as welll suck it up and bore it and install new flat tops.