Small Block Chevy Cast Alum. Short Pump Double Groove Lower Pulley

Speedway Cast Aluminum double groove pulleys for Small Block Chevy feature a 20% reduction. Reduction pulleys have a smaller diameter which slows the speed of your fan, water pump, and alternator to reduce drag for more top-end horsepower. Plus, high RPM water pump operation is improved due to reduced fluid cavitation.

• Machined from lightweight cast aluminum
• Superior belt retention with extra-deep grooves
• 20% reduction slows accessories down for less drag
• Adds top-end horsepower
• Reduces water pump impeller speed below cavitation threshold
• Improved high-RPM cooling capabilities
• 5-7/16" diameter

Note: The lower crank pulleys are manufactured thicker than normal stock pulleys.  This requires longer 3/8" bolts to be purchased separately.  Allen head type bolts recommended. 

Get the correct pulleys for your application by learning which water pump you have as explained in our tech article. SBC - Short vs Long Water Pump.  

Item Details

Cast Aluminum Lower