been stating that in several post, lol no i dont tear my engine after every run, i dont make money with my car, i just have fun with it you know a hobby?? I have been doing this for 14yrs and have some knowlegde about this stuff, i know what your gonna say next ketboard hero, why cant you diagnose a leaking headgasket??? well thats what this forum is for, asking to see if anyone else has had simuliar experiences, afterall who wants to tear the heads off the car if they dont have too?? as you can tell by the responses there could have been several culprits to this issue. water pump, thermostat, head gaskets, radiator, blockage in the cooling system. But you have a 10sec mustang and think your the shizzzz, dude get over yourself!