Should I keep these heads?

Bill, yup. I own a hughes cam... never ran it, but I did buy one...lol. I am surprised to hear the gringing issue tho. Honestly, aside from the lack of newer lobes, I stopped running MP for the same reason. They were ground terribly.. Like Gump's box of chocolates... I never knew what I was gonna get... AS long as the customer is happy, it really doesnt matter.