Quote:
Originally Posted by rwhite692
Get a long format die grinder w/ 1/4" collet (like you would use for porting) and solid carbide burrs, Get the one that is called "flame" shape...After you get it where you want with the burrs then you can switch to the conical carbide abrasive rolls, starting at 60 grit and working finer from there.
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x2. I didn't try it on the external part of my block. But I did do the top of the block for increased oil return:
Its lot of dirty messy work, but fun to look at when done.