if u actually want to build your motor right dont buy CAST pistons from EBAY. people dont just say ebay sucks because of the price, the parts aren't worth the cheap price if the manufacture is still making money on them. if you want to make serious power go for a nice set of forged pistons. a good set of forged pistons will run around 700-1000 dollars a set but your pistons are one of the most critical components of your engine and they take alot of abuse, dont risk your whole engine with a set of cast junk pistons from ebay