So three years ago I replaced the head gasket on my '97 and got the head surfaced and cleaned and even had a valve job done. put it all back together following the FSM instructions and this past weekend I was driving and noticed the temp gauge a 1/4 inch above where it normally is. So i pull over and no coolant was there added a gallon or so and drove home and immediately pulled the plugs. no obvious sign of water but water is coming out of the exhaust pipe. What would cause the gasket to go bad so soon. its only been on there for 10,000 miles or so. any ideas? did I do something wrong when reassebling?