definatly dont spend your money on one of the "do it yourself" deals on ebay, If you dont have the knowledge/experience, your engine will barely make it past break-in. myself and 2 buddies of mine bought 1 and we got about 2 races out of them after the break-in and con rods that needed to be replaced. so, for the record, just send it to the pros and forget about it pretty much.