Solid cam damage diagnosis help

Never seen one ground like PRH is saying, but I have no doubt he’s seen it, and I give him a good chance of being correct.

Funny...... “a good chance of being correct”.
Uuhhh.....just look at the wear pattern on that used cam.
The wear pattern shows you how the taper is staggered.

Just for grins, I just took a new SBM Comp custom and checked it for taper.
Right at .002....... with the taper staggered just like the used one in the pic.

That’s how they’re supposed to be...... and that’s how they are from the factory.

It’s very clear on all 16 lobes of this cam.
For each set of 4 lobes between journals...... the front two lobes are tapered so the rear of the lobe is bigger.
The rear two lobes are tapered so the front of the lobe is bigger.

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