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
Available for Short style pumps ('55-'68). Fits a 5/8" shaft.
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.
Cast Aluminum Upper