Whats the difference between the PR3 pistons and the P30 pistons???
Which one has a higher compression?
Which one is USDM and JDM?
I know that the P30 can come .25 overbored, but does the PR3 come .25 overbored?

Thanks for the info in advance

 

p30 has a higher dome, as well as it came in 92+ JDM civic/integra cars
P30 has a higher c/r by 0.2 in a stock b16a
p30 is JDM, pr3 came on first gen JDM b16as and all the USDM b16as
yes there is .25 overbore fro pr3
http://www.theoldone.com/articles/pistons/