Cam regrind?

YY1 said
How did a roller cam get worn like that?

...and new roller cams are considerably more than 50 bucks, Hundreds more.

I bought a used one from a FxBO member for $200 and was super happy.

At the time that was darn near half price.
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Looks to me like what happened is it sat up for a while and got rust on the lobes. When it was restarted the next time, it ate some lobes. Just spitballin.

Oregon will regrind a roller for 125. Not bad.