3” Wide 1/2” Pitch Blower/Supercharger Pulleys fit 4-71, 6-71, 8-71 Roots-style superchargers measuring 3 inches wide with a 1/2 inch . All pulleys are used, some have a few dings and some have clearanced holes designed for high-performance applications providing a secure and efficient connection between the supercharger and engine.
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