Visually checked valve guides and opened up the valve cover. Nothing jumped out. The problem now is being that the fault is still elusive I have to decide whether to explore more invasive diagnosis or just find a working short block (which I may have already found).
At this point tearing further into the engine will potentially cost more than popping a new one in.
I can shoot this last idea over to them but it's still a gamble and it will cost regardless.
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