Sounds like you had a blockage in one of the oil feed holes leading to the valves/valve adjusters (upper engine) The only question is why? blockage due to sludge, old oil thickening up, debris in the oil, faild oil filter, or a failing oil pump that is cavitating creating air pockets in the oil.
I'd run some seafoam in the crank for about 100k then get an oil change. Then keep an eye on things.
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