OK, so I have to report my error in part of the post I made below about the tappet geometry. Of course the reason they call a flat tappet camshaft that name is.....that the tappets are flat. In other words, no crown like I had reported. I've had a camshaft at a designer location for quite some time, and have learned more about these things, so I'm correcting my error.
The best one can do to promote tappet life other than proper lash adjustment and a great oil like Motul 20-50 is to polish the tops of the tappet. The instruction was 220 paper with an oil on the paper, do a figure 8 pattern on a flat plate.
The cam designer put a nice radius on the cam heal, so it would blend to the tappet during the rotation. Perhaps this is why the edges of the lobe chipped to begin with, then the concave collapse of the top of the tappet continued the degradation and then pooof.......the roof caved in.
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