mbdoc, I find your response interesting. If the valve is depressed against a spring by the cam lobe, how can a tensioner or stretched chain cause a valve tap, unless you think maybe a loose chain/tensioner noise is being confused with tappet noise?

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1983 380SL
1995 C280
1995 S500 coupe
1990 Mazda Miata
2004 Suzuki Hayabusa