ive just checked my new pistons are 0.070 thou higher than stock pistons, which at my bore means a c/r increase of 1.4 so around 9.25 which is the listed limited of c/r with my new whiplash cam and iron heads.
ive found a dyno plot of a similar engine, ive got same motor, same cam, same c/r, same headers but I have 50 cfm less carb and stock heads instead of the edelbrock rpm heads stock.
they made 491 hp 578 lbft
just trying to find out how much the 50 cfm and heads is worth roughly