Chevrolet big block underdrive crankshaft pulley Moroso 64210 with 25% reduction. Double groove cast aluminum pulley fits pre 1969 big blocks. Measures 5.4" O.D. 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 the 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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