I purchased a custom Billet Case Water-Cooled AM6 engine from Zedamotorsports, I did not receive the radiator that was supposed to come with it, and the engine just would not run to save its life when we got one for it! It made barely any compression, could not rev over 5000 RPM, just disappointing! I can't believe how much money I lost on this purchase, FML! Thankfully A good friend of mine was able to repair and rebuild the engine and make it run. If you buy from Zeda motorsports, don't be surprised when your engine needs work out of the box! Garbage garbage garbage!