Seller notes

1 NEW steel deep grove 3-1/4" Dia. pulley, machined from solid bar stock. The larger diameter reduces alternator RPM, reducing wasted horsepower. The .575" deep grove helps keep the 3/8in. or 13/32in. belt in place. Fits most automotive Delco, ford & other alternators with .669" shaft size, including Delco 10DN, 10SI, 12SI, 15SI, 27SI/Type 100 Series, CS121, CS130, CS144, and Ford 1G Series ER/EF, 2G Series IR/EF Alternators.NOTE; Pulley color may be silver or gold depending on current stock. So...

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