Quote:

i was going to fit the same piston i used in a few s/s engines in daves engine which is 104ish dome,,, would yeild 15.5/1 because the added stroke.




I should have carefully read all the replies, I see Jeff at modern already said same thing and you end up with 15.5:1.

1971 Factory Appearing Duster 340 11.000 @ 122 mph