And even before we get into catastrophic wear showing the lobe crown looking like a mushroom, the flat tappet lobes are initially ground with a taper from one side to the other and when this initial taper goes away the slope goes flat. Once the taper is gone, the lifter no longer spins and the deterioration accelerates. Even in a photo, if the wear shows all the way across the lobe, the cam is gone. A good flat tappet cam lobe will have a shadow where the lifter base doesn't touch.
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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 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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