Quote Originally Posted by allmotoronly
edit: I would also like to know the compression ratio of these setups:
1) GSR block/head with PR3 pistons
2) GSR block/head with P73 A0 pistons (USDM ITR)
3) GSR block/head with P73 00 pistons (JDM ITR)
4) GSR block P73 head with P73 A0 pistons (I guess it would 10.6:1)
5) GSR block P73 head with P73 00 pistons (same as jdm itr 11.0:1 i guess)
5) GSR block PR3 (or P30) head with P72, PR3, or P73 pistons

I know its a long list, but I have searched around and I am having a hard time finding C/R for the different pistons usinga P72 head, since most data is from a PR3 or P30 B16A head
http://www.c-speedracing.com/howto/c...c/compcalc.php

- OR -

Refer to Mike's stickied post in the All Motor forum CTR PISTON COMPRESSION RATIO