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howardI think Jay is correct on this one. Although the forty is not an officially timed track event Ben Johnson holds the unofficial record at 4.38 seconds. I think that figure was obtained by timing him in the first 4/5s of a fifty yard dash. The 4.2s and 4.3s you hear about at NFL tryouts are timed by coaches with stopwatches and are unreliable. I don't doubt that Mantle was timed at three seconds (which, if my math is correct, correlates to a 4.0 forty) but I do question the timing method used.
Howard