I am curious how my iron heads with pump gas will be with that ratio. Was hoping to keep it lower 9s but I think without having a custom cometic gasket that may be tough.
I get 9.06 if you assume .040 down...and round the 23.5 dish volume to 25cc to account for the quench pad that is milled off.
Pardon me but I don't know where the **** anyone got 9cc for a dish volume from when the ******* pistons dish volume grew when the taller quench head with pad was milled down past the pad and into the quench head itself to make it flush with the dish.
That piston untouched was designed to yield about 9.7 compression max...bringing it to 10.1 takes 59-60cc heads and still has a quench head with pad milled to .040 for the gasket... so think about it folks...if you relieve a piston you lower the compression...you're in effect increasing dish volume!
Been here n done this.. twice now!
Have the piston in front of me now...
