Sounds great Jerry. Can a good core be determined with just a micrometer or is it more based on cam lobe profiles? If the latter, cores would probably need to sent to the machinist for inspection 1st. Does that sound correct? Unless there is a way to inspect the lobes with a travel indicator rotating the cam between centers. If so, their must be specs available somewhere.
I've done very little automotive machining (Mostly Tool & Die and Machine Building) and find all of this to be very interesting. Especially with so many automotive machine shops shutting their doors.
John