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Old 07-13-2019, 08:27 PM   #3
slonomo
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Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,421
Default Re: Head porting tools for GX390/Predator420

I wouldn't use anything that aggressive. I liked my Dremel with abrasives. Those heads are aluminum so you have to keep the speed down or the metal will melt into the abrasive. You can use a wire brush to clean out the sandpaper material. Go slow, take your time, take a little off at a time. You can always take off more, but you can't put it back.
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