Crankshaft Pulley, Cast, double groove, 4 bolt dampeners, Ford 351-400 Cleveland, boss 302 Precision machined from high grade, lightweight Aluminium castings Extra-deep belt grooves provide added belt retention during rapid changes in engine RPM Small pulley diameter slows fan, water pump, and alternator speed to reduce horsepower-robbing drag High RPM water pump operation is improved, reducing impeller speed below cavitation threshold Uses 36° x 17/32 wide belt

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