Flat tappet cams can be damaged by using modern engine oils that lack zinc and associated anti-scuff additives. Zinc can damage catalytic converters, so it's slowly been eliminated in modern engine ...
It is possible to run solid flat tappets on a hydraulic flat-tappet cam and even mechanical roller lifters on a hydraulic-roller cam. Putting solid lifters on a hydraulic cam will gain about 500 rpm ...
An epidemic of cam failures has plagued owners of older cars recently. That part of the story is well established. The controversial part concerns the causes for the rash of prematurely worn camshaft ...
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