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Not sure of the specifics of the question but if the top nut/lock nut has a lip (and most do) that covers the top edge of the steerer than that steerer has to be at least short enough to clear the underside of that lip. By how much is not the issue as long there's enough thread overlap and the steerer doesn't contact that lip. This usually has a couple/three mm range.
What is meant by "headset top face"? Andy
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AndrewRStewart