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Small Block Chevy Aluminum Double Upper Pulley, Short Pump

Specs
Material Type:
Aluminum
Overall Length:
3.00
Sold in Quantity:
Each
Finish:
Natural
Shaft Diameter:
.63
Outside Diameter:
6.60
Belt Type:
V-Belt
Mounted Length:
2.71
Bolt Hole Pattern:
4 on 1.75
Belt Width:
.38
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. 5/8" center hole can be drilled out to 3/4" if needed. .30" thick at the hub mounting flange.
Small Block Chevy Aluminum Double Upper Pulley, Short Pump
Small Block Chevy Aluminum Double Upper Pulley, Short Pump

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Small Block Chevy Aluminum Double Upper Pulley, Short Pump

Details

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Q & A

What's in the Box

Cast aluminum double groove V-belt pulley for '55-'68 Small Block Chevy short 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
  • Double grooves for two V-belts

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

Notes

  1. 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.
  2. Water Pump ID Chart (GIF)

Item Details

Double Groove, 6-5/8" Diameter

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Small Block Chevy Cast Alum. Short Pump Double Groove 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
  • 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.  

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 Aluminum Double Lower Pulley, Short Pump
                        

Cast aluminum double groove V-belt crankshaft pulley for use with '55-'68 Small Block Chevy short style water pumps.

  • Precision machined aluminum construction
  • Lightweight and strong
  • Double grooves for two V-belts

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.

Aluminum Lower Pulley Spacer
                        Spaces lower pulley out to match with the upper pulleys. Each spacer is .090" thick aluminum.
                    
Universal Water Pump Shim Kit
                        

Water pump pulley shim kit provides proper drive belt alignment with pulleys.  Kit contains two aluminum 1/16" spacer and one 1/8" spacer.

Learn more about using different water pump accessories to best fit your application by reading our tech article.  SBC - Short vs Long Water Pump