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Small Block Chevy Cast Alum. Short Pump Double Groove Pulley

Specs
Material Type:
Aluminum
Overall Length:
2.90
Sold in Quantity:
Each
Finish:
Natural
Shaft Diameter:
.63
Outside Diameter:
6.65
Belt Type:
V-Belt
Mounted Length:
2.65
Bolt Hole Pattern:
4 on 1.75 or 4 on 2.13
Belt Width:
.36
Groove Count:
2
Garage Sale:
No
Notes
Mounted length is from the face of the water pump pulley mount towards the front of the engine.
Small Block Chevy Cast Alum. Short Pump Double Groove Pulley
Small Block Chevy Cast Alum. Short Pump Double Groove Pulley

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Small Block Chevy Cast Alum. Short Pump Double Groove Pulley

Details

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Q & A

What's in the Box

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
  • 910-15482
    • 6-5/8" O.D.

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.  

Item Details

Cast Aluminum Upper

You may also be interested in:

Moroso 64060 Chevy Short Pump Double Groove Crank Pulley
                        S/B Chevy, double groove cast aluminum lower pulley, 25% reduction. Available for short water pumps. 5/8" shaft.
  • 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 fan, water pump, and alternator speed to reduce horsepower-robbing drag
  • High RPM water pump operation is improved, reducing impeller speed below cavitation threshold
  • 5-3/8" diameter
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

Available for Short style pumps ('55-'68). Fits a 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. 

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.  

Small Block Chevy Cast Alum. Long 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.

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. 

 

Aluminum Upper Pulley Screw Kit
                        Set of four tapered seat bolts to properly secure upper aluminum water pump pulleys. Flat head cap. Black oxide finish. 
                    
Small Block Chevy Alum. Long Pump Double Groove Upper Pulley
                        Cast aluminum double groove V-belt upper pulley for '69-'85 Small  Block Chevy long style water pumps. Fits over 5/8" water pump snout, but can be  drilled out to 3/4" if needed. 
  • Precision machined aluminum construction
  • Lightweight and strong
  • Two grooves for V-belts
  • Hub surface to first groove center: 2.415"
  • Center-to-center of grooves:  11/16"
  • Center hole fits a 5/8" shaft (can be drilled out to 3/4" if needed)
  • Diameter:  6-5/8"

It may be necessary to shim either or both of the pulleys to achieve perfect belt alignment. There are variances between manufacturers of both water pumps and pulleys.

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.