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does it change pitch or volume as you rev?
i recectly had what i called a "whine" and it turned out to be my alternator shifted allowing the belt to misalign break my idler pulley..
check all your pulleys for tightness (no loose bearings) and that the belt is lined up properly... i also read somewhere that it could be the alternator trying to seize (or anything connected to the belt really) but the tension from the belt was making it turn anyway, causing the whine..
somethin' to think about.
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