Product Summary

Chevy Small Block V8, Mechanical Water Pump Type

  • This heavy duty aluminum water pump fits small block Chevy engines and is short water pump length of 5-5/8"
  • 3/4" ultra duty bearings with a 5/8" fan pilot to allow for use with stock fans and spacers
  • State of the art aluminum ribbed casting for additional bearing support
  • Precision high flow impeller delivers equal flow to both cylinder banks for maximum cooling capability
  • Comes with a plug screwed into the bypass hole that MUST be removed if this pump is used with a thermostat or on a street application

Key Specs

MFG. Part #91015546
BrandSpeedway Motors
Water Pump TypeMechanical
Water Pump StyleShort
Pump FlowStandard

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Speedway Motors 91015546 Details

Speedway Short Aluminum water pumps flow 35 gallons per minute at 4,000 RPM, with minimal cavitation and proportionally increased flow rates at 5,000 RPM and above. Equalized water flow distribution and pressure-balanced water passages minimize internal engine hot-spots making these pumps an excellent alternative for not only light duty racing, but also marine, trucks, towing, and motorhome applications. Cruisers and hot rodders will appreciate the improved cooling at low speeds.

"Short" style pumps came on all factory small block V8s from 1955 to 1968. However, this pump will fit all S/B Chevys up to 1985.

Learn how to choose the correct water pump for your application by reading our tech article.  SBC - Short vs Long Water Pump.   

Item Details

5/8" pilot


Speedway Motors 91015546 Specifications

MFG. Part #91015546
BrandSpeedway Motors
Water Pump TypeMechanical
Water Pump StyleShort
Pump FlowStandard
Housing MaterialAluminum
Housing FinishNatural
Housing ColorNatural
Block to Hub Distance5.625 Inch (5-5/8")
Heater Inlet Size1/2" NPT on the top/side
Hose ID1.79"
Shaft Length0.50"
Pilot Shaft Diameter0.63 Inch
Gasket(s) IncludedYes
Hardware IncludedNo
Weight6.15 lbs.
Sold in QuantityEach
NotesClearance from back of pump to engine block mount is .88"