Yea, but the tapping should be heard long before it gets bad enough to misfire. Basically the valve is still opening and doing its job, but just not opening as far because of the excess clearance. But that does bring up another point that he might have a valve adjusted way too tight and hanging open, and this could also cause a misfire.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 Catalina Safari Wagon.
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