It's kinda hard to tell, but I think you have a little surface rust on the base circle in the last snapshot. Probably from off-season storage.
Not a biggie. Take it to a machine shop and have them lightly polish it. Sometimes they call it "micro polishing".
It looks like the bearings could use that love too.
It's the same grit belt they use to do the final polish on a crank after it's been ground or just handled poorly by mechanic. A polishing belt is best after it's broken in. New ones take too much.
Re: cam grinding, When an old cam(a core) is ground, the base circle is ground too. The lift remains the same. Or , if you are modifying it like a hot rod, some changes are made in the new profile. I think they may flame harden after this(?)
A regrind probably costs more than a good used cam from MMI. I have even installed cams without polishing them in a few old timers—it's a judgement call.
Rock on,
Russ
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 Whiskeyjack a '68 Columbia 36 rebuilt A-4 with 2:1
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Last edited by lat 64; 10-30-2018 at 12:20 PM.
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