What's good H-T, need help trying to figure out my C/R on my B20V. I got JE pistons (part#185921), website said it's rated for 12.8:1 with a .040 headgasket, which I have. Now I was told that my C/R would be around 13.2 or 13.3:1, cause I'm running a b16 head that was shaved down, has a three angle valve job, 5000 series Ferrera flat valves. So if anyone could help me in figuring this out cuz want to get it tuned on pump gas to drive it on the street. I know my spelling may sucks and my English is horrible, not here for grammar class, just looking for helpful info, thanks.

 

Impossible to say because "we" don't know how much material was removed from the head. Might want to invest in a thicker HG or a different piston.