Well, I've had my p38 for just over 3 months and I'm pretty sure the head gasket is gone (don't ask me where). My motor is a 2000 4.0 V8 Thor engine, can anybody tell me a bit more about the cost implications of replacing the gasket. Is it something a novice mechanic, me, could do or should I take it to a pro? Any help or suggestions would be gratefully appreciated. Thank you, in advance.