i have a je pistons that are suppose to be 9.1:1 or 9.2:1 in an ls, im currently running a ls vtec with a gsr head with a cometic .030 head gasket, i cant seem to find the specs on the piston to punch it into zealautowerks (which i heard wasnt to accurate to begin with) im sure someone on here is running the same setup and know right off hand what it is

 

http://www.c-speedracing.com/h...c.php

maybe this will help

 

Calculate the total volume at bdc and divide it by total volume at tdc. If you know the combustion chamber volume in the head, the piston dish or dome volume, the piston to deck height, the bore and stroke size, and headgasket thickness then you can calculate it.