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Stewart Components 12103 Small Block Chevy Stage 1 Water Pump, Short


Material Type:
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Shaft Diameter:
Mounted Length:
Shaft Length:
Hose ID:
Gasket(s) Included:
Hardware Included:
Heater Inlet Size:
3/4" NPT on the top and 1/2" NPT
MFG. Part #:
Clearance from back of pump to engine block mount is .88"

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Q & A

What's in the Box

Uses new, OEM cast iron castings precision machined and assembled by Stewart Components to their exacting standards. They feature higher flow and pressure for better cooling. They have a 3/4" bearing and 5/8" shaft. 

  • Castings are internally modified for performance and reliability 
  • Compatible with stock lines and brackets
  • Precision ground hub for perfect pully alignment
  • Equal flow to left and right cylinder heads 
  • Recommended for stock, OEM, or mild performance applications 
  • One year warranty

Note: If using a mechanical fan, we suggest using a 3/4" shaft water pump.

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

You may also be interested in:

Speedway Small Block Chevy Short Steel Water Pump
                        Our 100% new, pressure cast & CNC machined pumps feature characteristics often overlooked by other manufacturers - precision-ground hubs to eliminate vibration; heavy duty ball-roller or ball-ball bearings; ceramic seal assemblies for extended life; closed-vane impellers for unsurpassed output; and zinc-coated backplates to stand up to corrosion. 

"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.

NOTE: This pump is designed primarily for street use and should not exceed 5,500 RPM.

Small Block Chevy Water Pump Installation Instructions (PDF)

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

Chevy Short Water Pump Bolt Kit, Stainless Steel

These stainless steel bolt kits will dress up your Small Block Chevy engine while giving it corrosion-resistant performance. Allen head.

This includes:

  • 3 each 3/8-16 x 1 3/4 Stainless Steel Socket Head Cap Screw
  • 1 each 3/8-16 x 2 1/2 Stainless Steel Socket Head Cap Screw
  • 4 each 3/8 AN Stainless Steel Flat Washers
Stewart Components 32203 Stage 3 Small Block Chevy Water Pump, Short

These pumps are assembled with 356-T6 heat treated aluminum castings. Precision CNC machined components. The fan hubs are 1/2" thick and machined from billet steel. These pumps are preferred by many top engine builders for higher RPM applications.

These Stage 3 water pumps feature 1/2" thick steel fan hub with set screw for positive positioning and 356-T6 heat treated aluminum casting. The S/B Chevy pump has an extra rigid cam stop with a 3/8" adjusting screw. The extra material adjacent to the block mounting bolts allows drilling and tapping up to 1/2" NPT holes for external cooling lines on S/B Chevy. There is higher flow and pressure for better cooling as well as equal flow to right and left cylinder heads. The 3/4" bearings offer 5 times the strength of standard bearings. Precision impeller installed to exacting tolerances. One year manufacturers warranty.

910-155 Instructions (PDF)

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



Speedway Reduction Pulley Combo for Small Block Chevy Short Pump

Kit includes a cast aluminum double groove cast aluminum water pump pulley, crank pulley, and a matched pair of heavy duty belts. Slows water pump speed by 20% for increased horsepower.

  • Upper Pulley Grooves:  Two
  • Lower Pulley Grooves:  Two 
  • Upper Pulley Diameter:  6-5/8" O.D.
  • Lower Pulley Diameter:  5-7/16" O.D.
  • Upper Pulley Snout Hole:  5/8" O.D. (can be drilled out to 3/4")

Fits Small Block Chevy V8 with '55-'68 short-style water pump with 5/8" shaft.

Note: The lower crank pulleys in our combo kits 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.


1955-68 Small Block Chevy Single Groove Upper Pulley, Short Water Pump

These upper pulleys for 1955-68 short water pumps feature a single groove with a beautiful chrome finish.  They will work with 283-350 V8 small block Chevy engines.  Sitting flat on the workbench, the pulley is 2-3/4" high in the center at the water pump.

  • Upper pulley
  • 1955-68 283-350 V8 small block Chevy engine
  • Short water pumps
  • Single groove  
  • 7-1/8" Diameter
  • Chrome plated finish

Note:  These upper pulleys will not work with our lower pulley (91015424).  Use our lower pulley (91015422) to correspond for proper alignment with these upper 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.

Small Block Chevy Water Pump Gasket

Small Block Chevy Water Pump Gaskets

  • Paper
  • 0.03" thick
Red Line 80204 Water Wetter Coolant Additive

Red Line Water Wetter Super Coolant additive is a unique wetting agent which reduces coolant temperatures by as much as 20° F. This is a liquid coolant treatment product which is designed to be added to solutions of antifreeze and water to help improve the heat transfer properties of glycol-based antifreeze. This liquid product can be used to provide rust and corrosion protection in plain water for racing engines, which provides much better heat transfer properties than glycol-based antifreeze. Improves the ability of coolant to wet heat transfer surfaces by 50%.

  • Reduces or eliminates bubbles that form on hot metal surfaces to reduce coolant temperatures by up to 20°
  • Superior heat transfer properties compared to glycol-based antifreeze
  • Compatible with new or used antifreeze (including DEX-COOL and long-life versions) to improve the heat transfer of ethylene and propylene glycol systems
  • Improves heat transfer and reduces cylinder head temperature
  • Designed for use with all modern aluminum, cast iron, copper, brass and bronze cooling systems
  • Cleans and lubricates water pump seals
  • Reduces cavitation and complexes with hard water to reduce scaling
  • Does not lower cooling system below the thermostatically-controlled temperature
  • 12 fl. oz. bottle treats 12-20 quarts

Water Wetter Tech Info (PDF)

Learn more about how cooling systems work with proper coolant mixture and additives by reading our tech article. Cooling System Principles.   

Book - The Official Guide to Cooling Systems

Learn the secrets of how a cooling system works so you can solve your own cooling system problems. This book was written by a man who has 20-plus years preparing pre-1948 cars for the 4,000-mile Great Race across the United States. Great info for all, but geared toward the Flathead Ford V8.

By Randy Rundle. 8.5" x 11", 36 pages.