Product Summary

Chevy Small Block V8, 4.00" Overall Width, Aluminum

  • Die-cast, polished aluminum, ring sealed water neck
  • Fits Chevy V8s '55-'86 accepts normal GM thermostats and 1 1/2" I.D hoses
  • Strongly recommended for any performance application
  • Modified for high RPM/high flow applications, 180° temperature range
  • Includes hardware

Comes as a Kit

Key Specs

MFG. Part #9100578
Material TypeAluminum
Gasket(s) IncludedNo
Hardware IncludedYes

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Speedway Motors 9100578 Details

Thermostat Housing

This water neck includes 2 stainless steel bolts and o-ring gasket. Constructed from aluminum and features a painted black finish. Straight angle and has a 1 inch tube length. Sold each.

  • 4" overall width
  • 2.15" overall height
  • 1.5" hose inside diameter
  • Straight angle
  • 1" tube length
  • 1.25" tube inside diameter
  • Aluminum construction
  • Painted finish
  • Black in color
  • Hardware Included
  • Includes o-ring



Speedway takes a quality Robertshaw 330-180 high flow 180° thermostat, then modifies it to function properly in high RPM, high flow applications. They feature a balanced sleeve design and are strongly recommended for any performance application. Fits most domestic applications.

  • 2-1/8" diameter 
  • High flow 180° thermostat
  • Balanced sleeve design
  • Recommended for any performance application
  • Fits most domestic applications

Learn more about the importance of the thermostat with cooling systems and how they work by reading our tech article, Cooling System Principles.

Speedway Motors 9100578 Specifications

MFG. Part #9100578
BrandSpeedway Motors
Material TypeAluminum
Gasket(s) IncludedNo
Hardware IncludedYes
Overall Width4.00"
Overall Height2.15"
Hose ID1.50"
Tube Length1.00"
Tube I.D.1.25"
Sold in QuantityKit
NotesIncludes O-Ring