View Full Version : Quick question about TBI mods.
05-25-2009, 10:26 PM
I just finished smoothing the air horns on my throttle body, looks good so far, just curious what you guys are using to polish the bores, I have a few marks where the die grinder got a bit happy.
1988 GMC 355
05-26-2009, 06:03 AM
When I did mine on my old truck I didnt smooth them but I think that some sandpaper or a sandpaper drum on the die grinder would be good with maybe 400 grit.
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