Hey man thanks and thanks to farmtruc that thread answers alot of questions. But also if I go to buy some good long tube headers I would to need to buy them for the Ls1 not the 5.3l right? Thanks again. O btw I have been lookin on ebay but most I have seen are complete engines w/transmissions or just complete engines and the only blocks I have seen have either have a defect and come with no heads, whats the best way to go about getting the engine? Thanks