I was afraid that might be the issue. My only wonder is that I am not seeing any evidence of coolant smoke coming out of the tail pipes, no over heating and the oil looks clean (I.E. no milky appearance or coolant in the oil). Is this common with Subaru's? I am reluctant to have it fixed because the car has 120,000+ miles on it. I am assuming the fix would require having the head machined as well as pulling the entire motor.