Chevrolet small block single groove crankshaft pulley Moroso 64100 with 50% reduction and deep groove. Fits 1969 and newer small blocks with long water pump. Measures 4.0 inches O.D. Precision machined from high grade, lightweight aluminum castings. Extra deep belt grooves provide added belt retnetion 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 17/32 inch belt.
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