8ad-f85 said:The flat IS the quench
That piston is a pretty good design with the exception of any sharp edges that might be left, like from the valve notches.
It would be strongly encouraged to radius those if concerned with ping.
This is a case in which a SLIGHTLY higher compression resulting from the increased quench area would likely do a better job with pump fuel.
8ad-f85 said:With a dish like that, there is nearly no quench.
The ring around the edge of the piston IS the quench area.
Put the 'intake closing' point, along with your engine specs into this formula.
Make your goal 150-170psi (using bigger cam specs) to BEGIN planning your next build.
Still need to figure out oiling issues and determine other clearances before the necessary machine work.