Usually a good visual inspection will be sufficient to determine if a cam can be reground, particularly if there's not going to be a radical change in the lobe profile. I've got one really good looking core cam- - - - -on 11 lobes. The last one in line has some deep pits that probably won't be able to clean up on a regrind. Obvious lobe wear or deep rust pits are reason to reject a core, but if the lobes don't have any visible wear, the cam will probably be OK. You can also compare the base circle diameter and total lift with just a micrometer or an accurate digital caliper.

There are several good you tube videos of cam regrinding- - - -the process is extremely interesting.

www.youtube.com/watch?v=fUQnHk_LRz0

Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!