Product Summary

Chevy Small Block V8, 5.44" Overall Diameter, Aluminum

  • S/B Chevy, double-groove pulleys, 20% reduction
  • Available for long or short water pumps
  • 5/8" centering hole

Key Specs

MFG. Part #91015488
BrandSpeedway Motors

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Speedway Motors 91015488 Details

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.

This is a 25% reduction pulley when used with the correct upper pulley, part number 91015476.

  • 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
  • 910-15488
    • 5-7/16" O.D.

Available for long water pumps. 5/8" shaft.

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. 

Item Details

Cast Aluminum Lower

Speedway Motors 91015488 Specifications

MFG. Part #91015488
BrandSpeedway Motors
Overall Diameter5.44"
Mounted Length2.80"
Inside Diameter.79"
Groove Count2
Belt Width.41"
Belt TypeV-Belt
Material TypeAluminum
Sold in QuantityEach
NotesMounted length is from the face of the harmonic balancer towards the front of the vehicle. 25% reduction.
Water Pump StyleLong