I just bought my z and the guy said that the motor was excellent and it had kw valves and springs. Also stage 2 hot cams. Turned out the valves, piston and rings, timing chain were all junk and had to be replaced. (what an WooterWooterWooterWooterWooterWooterWooter) The mechanic that took the head oof and found this out said that there were no kw valves in it. And he wasnt to sure about the hot cams. Said they are prolably stock. i just want to know for sure. He had a head there with hot cams in it and we compared them and mine looked stock. BUT IDK. Can anyone help me ???