I have given up on cheap electric die grinders. I have a long body and 2 short body, Snap on straight air die grinders (hey that was what became available) plus a few angle die grinders. but I have never tried the angle die grinders on porting work. so far on the slant 6 heads I have done, these air powered ones have been the ticket. I have both long and short carbide burrs, and 1 of the short body die grinders stays at work. I use short body die grinder with long burrs and vise versa. for burrs I got a few from Fastenal, weren't terribly expensive. the rest come from a place online, look up Benchmark Abrasives. they have an awesome 10 pack (trial/sample pack) of various grit flapper wheels for a 4-1/2" electric angle grinder too. $10 for the sample pack.