I missed this part, but how is a dish piston going to be able to provide quench?
I'm in the process of lowering the compression in my 493" RB from 12 to 1 to 10.2 to 1. With a .040" thick head gasket, and a 75cc heart shaped chamber. I still have to run a zero deck step piston with something like a 23cc dish just under the valves leaving over 2/3rds of the piston a flat top at zero deck.
I don't understand how those dished pistons with just a ledge around the perimeter will provide any quench. Please clarify if you would.