Quote:
Originally posted by AlligatorBling
When I put a performance cam in my fourwheeler I did some polishing on the intake valve with fine grit sand paper, I got it smooth as glass... it wasn't that hard for me because my fourwheeler only has 2 valves for the entire motor (yamaha 350 warrior)... this might be more time consuming for a 16 valve motor, lol....
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you want the intake port to be rough, to aide in mixing atomized fuel with air flowing through the intake (unless you have a GDI car like the new 7-series).
you want the exhaust ports to have a mirror finish, so that carbon deposits won't build up as easily.
Standard Abrasives offers their guidance online:
http://www.sa-motorsports.com/diyport.htm