Ok so i dont knwo if anyone is familiar with SolBlu's Helpful Del Sol Site site. The D-series compression calculator, and i use it alot to mess around for future piston/block/head combo's. Well the way my motor is set up i have 8.1 compression. Alot lower then i though i would have from my Vitara's, i was told it was 8.6:1cp. Well i want to get new pistons to up the CP to around 10:1. It's telling me that with d15b7 pistons i will have a 10.1:1 compression.. Can you put d15 pistons in a ZC??!??! I have no clue, and i thought you couldnt. Otherwise my only option would be D16A6 (PM6's) which would put me at about 9.5cp. What you guys think?