340 High Compression Pistons

yellow rose said
What head. We are talking about a regular old, plain Jane combustion chamber Chrysler used for years, even on the W-2.

I'm out of patience. You are either ignorant or talking about something other than what the OP started this thread about. Now I need to go back and look at what the OP said.

Still talking about a Edelbrock RPM 340 head. This is not rocketscience if you have ever taken a good look at a set of those,on a pair of ancient stock openchambers its a whole other deal.