in this tank, everything can be placed in. up to 500 lbs, so im good to go. its lowers the temp using the nitrogen to 300 below i believe and goes by 1 degree a minute, holds it at the temp for a bit, then brings it back to room temp 1 degree a minute as well. im actually pretty excited because one, its free, and two, it can do nothing but help anyway. so thanks a ton for the info, if anyone else has something to say, please do! im all about getting all the opinons i can, or experiences, or anything, even ideas? at this point, ill be doing a crank, pistons, rods (2 sets of each, for future use), bearings, piston rings, and all my bolts etc. since what ill have apart is the bottom end. any other ideas, lemme know! or correct me if im wrong in any of these. would you have a header done? aftermarket dc i blieve. not for any real reason, but just to do it... cuz i can... hehehe *evil grin*