You guys and your coarse burrs kill me. I port a lot of heads and rarely use an aluminum coarse cut burr. I mainly use double cut burrs dipped in a WD40 transmission fluid mixture. An aluminum burr cuts, bounces, gouges, and digs compared to a double cut burr. When I’m done honestly I rarely even use a sanding roll on my stuff. Customers like to see smooth and shiny so I may buff their stuff up some. Slow the grinder down to a speed you can handle and grind away
 I'm no pro porter by any means, but I do some whittling on my own stuff. The aluminum cutting burrs are very aggressive and definitely more prone to bounce and gouge from my experience. I only use them when I'm removing a lot of material...like taking the cloverleaf out of a 4500 flange intake. Once the big stuff is gone, I go to the cast iron type burrs. As long as you keep it lubed, it works fine.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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