I just recently refreshed my ITR b18c5 bottom end.

Stock USDM ITR pistons 10.8:1cr??
ACL bearings
balanced and polished rods
balanced pistons and polished crank
New OEM ITR oilpump, tensioner and water pump

The head is fully built with a gasket match. (the port is slightly larger than gasket to be exact)
5 angle valve job
1mm oversized Ferrea Valves, Valvesprings, valve seats and valve guides, felpro valvestem seals.
Supertech retainers
Skunk2 Pro 1 cams
The head's been milled twice.

Edelbrock Victor X, 70mm w/ adaptor plate, ported to match intake ports on head

Now im wondering if I should order some 12:1cr pistons or should I just keep the stock OEM 10.8:1cr pistons? Would the 12:1cr pistons make much difference? My friend says it doesn't. But my other buddy says it does. So WTF, you know. So should I spend an extra $500 just for the 12:1cr pistons?

 

or should i just run a thinner headgasket on it?

 

i would personally go with the high compression forged pistons i think yooull see some better numbers. up to you though.

 

The thing is that I already had the whole block assembled and now I'll have to pay another 200 just to have the shop change it out. I was thinking about the 12:cr but one of my buddy says not to waste money and just go with what i have. :/

 

one of my friends made 200whp with just a built head and pro1 cams. but apparently he wasn't satisfied with it so he put another 5grand into his motor.

 

then just stick with what you got if its already in no reason to pull em out

 

you really think so? thanks