- This is an original Moroso Performance aluminum deep groove race pulley
- Moroso manufactures premium quality components for race and performance applications
- This BB Chevy single groove crankshaft pulley is for short water pump (pre '69) applications
- This 4" diameter pulley gives reduction in accessory drive speed
- Precision machined from high grade, lightweight aluminum castings
- Extra-deep belt groove provides 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