ok i was driving to work thurs. and i stopped at the store to grab a drink, when i started the car again i was blowing huge clouds of white smoke, it overheated two days before i changed the rad cap, and the thermostate, and all seemed to be going great, tell the smoke i took of the head and the gasket looked in great shape, and suggestions? the head has alot of build up in the exhaust ports that is white. any help or info on where to find it would be much appretiated, thanks ahead of time.