Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
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If you are installing a replacement headset and the original one just wore out but operated smoothly when it was new, reaming and facing are probably not needed. If the old headset was rough and tended to pull to one side or the other, then have the headtube faced.
If this is a new frame and has never been built up, reaming and facing are probably a good precaution.
The old starnut can be reused if it's at the correct depth when you fit the fork, spacers and stem. If it's too high, drive it down to the right depth. If it's too low, drive it all the way down (or out the bottom if the steerer is open there) and install a new one.