Greetings . . .

I got my hands on an apparent NOS crank for an early '50s powerglide car:




I plan to use it to stroke my 216 - one of many tricks planned.

During my inspection of the item all looked well except for some rather tough looking grinds on two of the counter weights:


both inlcude strange markings below the grinds:


Are these grinds part of the normal balancing work done at the factory? Or has this part since been ef'd with?

I am going to send it to a machine shop for balancing. Should I have them lighten it as well?

Any insights will be greatly appreciated.

regards,
stock49

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