Ok I know this is a all motor question but I asked there and no one has a response., I want to run p30(99 SI) pistons in my ls-v. Now I seen a set on ebay from company called NPR anyone even use them????

 

P30 pistons come from the JDM spec 2nd gen B16A which yields .2 higher compression, so the in a B16A it would be 10.4:1 instead of 10.2:1 like all those found on usdm models

Not sure what compression would be on an LS vtec

 

nope, but it yields about 11.5 compression ratio....

 

11.8:1 with a b16 head and 12.1:1 with a GSR head.

This assuming you are using an OEM 3 layer headgasket.

http://www.c-speedracing.com/howto/c...c/compcalc.php

Plug in what you have, this will give you a pretty decent idea, depending on if you milled the head or not also.

People have used the NPR for ITR pistons, for a nice little NA b16 action.

https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/npr-pistons-piston-rings-2569157/ This thread has a few people that have used them. Hopefully you find what you are looking for.