Sometimes people get lucky........ where there is no lifter rotation...... and it doesn’t eat the cam.

Then....... other times there is plenty of rotation...... and it still eats itself up.

In these two cases...... the one without rotation only had about 1/2 a thou of lobe taper on the cam.
That’s usually a recipe for a wiped cam.

The one that ate the lobe had the full 2 thou of lobe taper.
It was a fast rate .904 design lobe, but was run without high zinc oil(Castrol GTX).
3 other lobes were starting to go.
It was an unbushed block, so there’s a possibility of lifter bore position being a contributing factor.

Both of these motors rec’d different cams that worked out fine(so far...... 1 year of service)....... so it wasn’t like the block was screwed up enough so that nothing would work.