roller cam rip off

It's not as simple as using the flat tappet specs and spitting out a roller with them. You can do it, sure, but it will never run to its full potential. The profile between the two lobes is so drastically different. You should call Oregon Cam and tell them your basic idea. They can grind whatever you want. But they will know best how to transfer from one type profile to another.

I had them regrind my Hemi cam. It was a stock hydraulic core. They reground it to a small street solid with no trouble at all. They are very good at what the do. Plenty of other cam grinders out there too, but I have found Oregon to be courteous. They spent over an hour on the phone with me telling me about their process and helping me make a decision.