John, I certainly do hope the valves are the issue, and nothing else. I will squirt some oil in the #4 to see if it is similar to #3. Then take off the valve cover some time this week to investigate more.
Worn head gasket might be possible although the coolant has always remained at the same level and the oil looks good w/o mixture of other fluids. But maybe, just maybe a leak so tiny that only air can only escape? If so,wouldn't I have smelled fumes in the engine bay with the engine running?
-DS
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