Re: Head gasket?
Ill go into the weeds with this..Fixed timing is a cause of head gasket failure.
Why? when you set your spark lever in one spot and drive,the only time the timing is correct is at the rpm the lever is set at..any other rpm,say accelerating for instance,or idling,the timing is either too far advanced or retarded (depending on engine RPM) raising and lowering combustion chamber temperatures..this alteration of temperatures expands or contracts the head,forcing the head gasket beyond its ability to seal.
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