You've got the right idea... just the wrong way around. As the piston goes down, or up, it is going to move air (Intake it or exhaust it). If the valves are sealed and closed, the only other option for the air to move would be through the open spark plug holes. If the valves were NOT sealed, air would just move in and out through those open valves instead of the plug holes. So the one that he felt no movement through the plug hole... would be a bad one.
I would have to agree with Pro... bad as I hate to!
Tod
I would have to agree with Pro... bad as I hate to!
Tod
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