alrights now i need some help i know that if i use ITR's in a gsr you will get 11 5 compersion and if you use CTR's you get 12 1. Ok its obvious i will get more power using CTR pistons but some people have told me i might have to worry about valve clearence. Should if say F*&% it and use CTR's or stay safe and use ITR's someone help me out

 

Here's some help links. I'm not sure which calculator is more accurate but at least it'll give you an idea

http://technet.ff-squad.com/cr-calculator.htm

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

And here's a little info on B-series pistons and suggestions

http://www.ff-squad.com/tech/temp/pistons.htm

 

what motor is it going in?!??!

 

use b16, its not as aggressive as the ctr but still better than itr, and prolly cheaper, and more readily available. As far as i know you wont worry about valve clearance.