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Typically that's because the camshaft is improperly timed. If a piston kisses a valve you'll usually cause serious damage to piston, valve, head, pushrods... all because a valve tried to open at the wrong time.

Another possibility would be a seized valve, but that's far more common in engines that have not been used for a long time. I would say ,possibly a bent valve stem. if the engine has run ok in the past. although the above answer may very well be correct.

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16y ago

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Q: What causes push rods to bend?
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