Hydraulic cam core Used for a.roller regrind?

I believe the real issue is finding a blank cam core to grind one...

The small blocks are long out of production and who is going to make a raw cam core for an obsolete engine??? Not enough volume/profit to make it worth while...
There are still scads of "obsolete" engines running out there and being rebuilt and hopped up. Cams are available for stovebolt Chev 6's, A, B and C Ford bangers, Flathead Ford V8s, Ford 6s and the slant 6. A little tougher to find a cam for say a GMC 376 CID V6 or 351M.