Hydraulic cam core Used for a.roller regrind?

I’ve asked Ken about it with the SBM before. He says the small block hydraulic lobe centers under the lifter and the flat tappet is offset under the lifter bore. The metal is okay, but only half the roller runs on the cam on a flat tappet ground for an hydraulic roller. He says there’s one of the major reman engine parts company that had been doing it, and failure rate was near 100%. So yes, find a hydraulic roller core.