Quote:

I finish the chambers and EX ports with a 120 grit roll. The intake ports get finished with a 60 grit roll.


That's basically what I do, too. If an 80 gets the desired results w/ the exhaust, I don't bother going to the 120, though.

My rolls are a mix of straight & tapered 3/8" and 1/2", depending on the grit and contours I'm working with.