I ordered 240 heads today i guess i will try those with out porting at first. Now i try to choose Pistons i have been thinking between 3 different Pistons currently, Mahle PowerPak, Diamond racing and Icon. Mahle and Diamond are 4032 alloy and Icons 2618. With Mahle comperssion ratio is about 11:1 and with Diamond and Icons its about 10.6:1. I looking to make quite bad *** street engine that sees some strip too. I guess best choice is solid roller cam and looking for about 650 horses atleast. I just dont know how close to limit those 4032 alloy pistons are with that kind of engine? I know heads getting close to limit but i guess that is possible with right cam?