Scrapiron, your heads came apart due to hard use, just like they should have. Work them hard, they wear out. But for a every day, drive around car, you will never wear out a stock valve seat! The turbo engine might be hard on parts, but the amount of air coming past the valves will be enough to cool them and keep from burning the seats. As we all know its the heat that kills them, low rpm lugging heavy loads, the valves overheat and beat the red hot seats to death. Joe
