I am starting to build my civic (w/GSR motor), I have eagle forged rods, I am going to buy a set of pistons but I am not sure how high of comp I can go without having problems? I can buy 93 octane regularly and 110 if I wanna pay 5/gal. But my question is can I use 11.5:1 pistons in my GSR motor with a SCE copper .043" head gasket? I have thought about adding a single fogger 50 shot for a little extra power when I need it. Nitrous also raises compression would I be able to use that safely with that same setup or would I have to use 11:1 pistons ?

 

You can run 11.5 to 1 easily if you have a tuneable ECU.

I would stay way from the copper headgaskets if I were you. Copper will compress and you'll lose head bolt torque and eventually blow the gasket. Just my theory though but I am not going to prove myself wrong by running one.