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The scope is a great tool to investigate the issue. I have had valves stick before and ended up with bent push rods and tubes. I would not operate the engine until the symptom is verified. If you can't verify the issue then pull the jug and proceed with overhaul or evaluation at the shop. Check the cam lobes carefully for any damage also if it was a sticky valve.
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Herb R Harney
1968 337C
Flying the same Skymaster for 47 years
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