If the forks are worth more to you than the stem then saw it off as high as you can and then undo the headset, then grab whats left of the stem in a vice and WD it, twist it, heat it until the S.O.B. lets go.
@ancientfixie started
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If the forks are worth more to you than the stem then saw it off as high as you can and then undo the headset, then grab whats left of the stem in a vice and WD it, twist it, heat it until the S.O.B. lets go.