Valvetrain clearance is usually more of a "ticking" sound, while "knocking" is ususally associated with bottom end clearance, such as the rod bearings.
One who places safety first is, quite specifically, a coward. We do not go to war to be safe, neither do we climb mountains, or race cars, or hunt buffalo, to be safe.
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Badder than old King Kong
And meaner than a junkyard dog
-Jim Croce
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