Product Summary

Chevy Small Block V8, Mechanical Water Pump Type

  • Satin or polished finish
  • Dual pattern hub with shim spacer
  • Includes gaskets and hardware

Key Specs

MFG. Part #91015578
BrandSpeedway Motors
Water Pump TypeMechanical
Water Pump StyleShort

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Speedway Motors 91015578 Details

Each pump is manufactured from T6 aluminum and features an impeller with curved vanes for maximum flow, pressure and equal distribution to both sides of the block. It also features a unique seal assembly for leak proof operation. 

  • Beautiful polished aluminum finish
  • 5/8" shaft with 5/8" fan pilot snout
  • 1/2" NPT hole on passenger side (for heater hose) and on top (for bypass hose)
  • Stamped steel rear plate
  • Extra thick fan hub
  • 5/8" bearings
  • Adjustable cam stop
  • State of the art aluminum castings
  • Equal flow to both cylinder banks
  • Precision impeller
  • Higher flow rate and pressure rate
  • Weighs 6 lbs.
  • Does not have a set screw retaining the fan hub
  • Includes gaskets and hardware

NOTE: This pump is designed for street use and is not to be run on a motor which exceeds 5,500 RPM. 

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


Speedway Motors 91015578 Specifications

MFG. Part #91015578
BrandSpeedway Motors
Water Pump TypeMechanical
Water Pump StyleShort
Housing MaterialAluminum
Housing FinishPolished
Housing ColorNatural
Block to Hub Distance5.625 Inch (5-5/8")
Hose ID1.80"
Shaft Length.50"
Pilot Shaft Diameter0.63 Inch
Gasket(s) IncludedYes
Hardware IncludedYes
Weight6.5 lbs.
Sold in QuantityEach
NotesIncludes gaskets, mounting bolts, and shim. HUB DIA. 2-3/4 INCH