Well... the stones are much easier to control... and don't take off as much, don't jump or catch, and don't snap/bend like these. After using the burrs today I used my drill and stones after to smooth as much as I could out... the harbor freight die grinder is only 1 speed... maybe I should get a dremel or the variable speed hanging grinder, that would probably work better...
I can't reach a couple
Or pay 130 to have new valve seats cut and 250ish to have the x heads ported by the shop... probably much easier and quicker lol.