Thanks, some good thoughts. Re-torquing went as expected. Maybe a few degrees of turn on 2 or 3 and the others clicked the wrench without any movement.
New valves, springs and keepers. The guides were reused as they were good according to the machine shop.
The backdraft from the carb and associated gas mist on my hand (dangerous now that I think of it. A carb backfire would lite my hand on fire!) has to be a clue.
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