The March Performance 139 is a single-groove V-belt alternator pulley precision-machined from 6061-T6 billet aluminum. Designed for strength and long-lasting performance, this pulley also adds a polished, custom appearance to your engine bay.
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Perfect for street rods, muscle cars, or performance vehicles using a V-belt drive system. This pulley is designed to fit most GM-style alternators but always confirm bore size and belt alignment before ordering.
Limited Staff March 5, 6, & 9, Closed Saturday March 7.
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