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I think I overlooked something. If the head is OFF an engine, with "overhead valves," the pushrods would have been removed first.. therefore ALL the valves would be closed (head OFF) because the cam is not holding certain valves open. NB
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Ah...correct, but we could probably devise what the valve positions
must have been based on the current crankshaft position - which couldn't have moved - because it is seized.
There may have been pieces of acorns in there too - I can't remember if I saw them or heard about them - or if they were large enough to have gotten in through the spark plug hole..