Chevrolet small block deep groove crankshaft pulley Moroso 64050 with 30% reduction and 5.25 inch diameter. Fits 1968 and older small blocks with short water pump. Precision machined from high grade, lightweight aluminum 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 17/32 inch belt.
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