1937-48 Flathead Stock-Style Water Pump with Wide Belt
1937-48 Flathead Stock-Style Water Pump with Wide Belt
Speedway Motors

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#91015593

1937-48 Flathead Stock-Style Water Pump with Wide Belt

  • All-new high-nickel iron castings ensure worry free performance
  • Severe-duty roller and ball bearings ensure long pump life
  • Ceramic seals on sturdy 3/4" shaft
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$146.99

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Product Summary

Mechanical Water Pump Type, Steel Housing Material

  • All-new high-nickel iron castings ensure worry free performance
  • Severe-duty roller and ball bearings ensure long pump life
  • Ceramic seals on sturdy 3/4" shaft
  • High-flow modular impeller reduces cavitation for a cooler running engine
  • Gaskets included to simplify installation
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Key Specs

MFG. Part #Select Side
Water Pump TypeMechanical
Water Pump StyleShort Depth
Housing MaterialSteel
Housing FinishPainted
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Details

Original Flathead water pumps have always suffered from unreliable bronze bushings and carbon seals. They almost always leaked and even Ford manuals warned mechanics not to tighten fan belts too tight. The excess slack allowed belts to slip and lose contact with the generator and water pump pulleys, causing more cooling and power problems.

Speedway's completely new water pumps feature severe-duty roller and ball bearings, close tolerances and modular impellers to provide maximum flow and reduce cavitation. They also have modern ceramic seals on a heavy duty 5/8" shaft, making the assembly exceptionally strong and more efficient. All mounting areas are spot faced for improved fit and sealing.

  • All-new high-nickel iron castings
  • Severe-duty roller and ball bearings
  • Ceramic seals on sturdy 3/4" shaft
  • High-flow modular impeller reduces cavitation
  • Gaskets included
  • For systems with 5/8" drive belts

Factory replacement for 1937-1948 Ford and Mercury cars and trucks. Includes gaskets.

Water Pump Features (GIF)

Item Details

For Wide Belt Applications, Gaskets Included

Charts

Warranty Information

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Note: Removing the pulley voids warranty.

Specifications

KEY SPECS
MFG. Part #Select Side to see
BrandSpeedway Motors
Water Pump TypeMechanical
Water Pump StyleShort Depth
Housing MaterialSteel
Housing FinishPainted
GENERAL
Pulley Type CompatibilityV-Belt
Pulley Diameter4.35"
Groove Count1
Belt Width0.63"
Housing ColorBlack
Mounted Length3.31"
Hose ID1.75"
Pilot Shaft Diameter0.63 Inch
Overall Height9.00"
Gasket(s) IncludedYes
Sold in QuantityEach
NotesIncludes motor mount flange. 1.00" from engine side of pulley to mounting flange.

Ratings & Reviews

4.7

20 Reviews

Overall Assessment

Customers commend the product for its quality and practicality, with many noting it as an improvement over original designs and models. It is praised for its flawless performance, heavier duty, accurate fit, advanced functionality, and no leakage. Despite some needing adjustments with bolts for fitting purposes, the product's usability and material quality stand unrivaled. It has received particular applause from classic car technicians for its redesigned features. Several customers showed their trust by expressing their willingness to repurchase the product. The product received isolated criticism regarding leaks after some thousand miles. Nevertheless, the overall customer feedback necessitates refining minor fitting details while maintaining the product's current superior qualities.

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4.7

20 reviews

5

17

4

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2

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Most Liked Positive Review

5.0

Excellent quality product with great enh

Product bolts on and performs flawlessly. Will not pass muster for originality in judging competitions but functionally is on the mark. Body of the pump will need painting to match original Ford/Mercury blue (or green), and as well the end of the shaft in the middle of the pulley wheel requires painting black to maintain the fundamentals of originality. Given the wheels are cast the black semi-gloss finish is correct for the pulley only. Given my motor is new I am running a bit warmer than previously as expected (during break-in) so cannot comment at this time on the increased flow performance of the pumps. Performance to-date since install has been excellent.

Most Liked Negative Review

1.0

1932 thru 1948 V8 water pumps

Your new pumps started leaking after a few thousand miles with in a couple of weeks from each other. I have used the original truck pumps with good service for many years before trying your pumps and will be going back to them. Norm

Filter by Ratings

I will buy again

5.0

2 years ago

no nickname

danville illinois

Verified

worked out great had to grind the casting a little because it hit the timing cover

Would Recommend

i may buy again

5.0

2 years ago

N/A

Detroit MI

Verified

great deal of improvements to make them last. BEWARE future buyers, the castings are thinner. you may need to shorten mounting bolts on the middle mount hole and the inlet hole at the bottom. check length first and make needed adjustments to mounting bolt length. if you don't check this, your bolts will bottom out before they compress the water pump to the block and you will be dealing with leaky pumps. no fun

Would Recommend

I would highly recommend this product

5.0

3 years ago

Ron

Santa Clarita

Verified

This product was a perfect fit and worked flawlessly.

Would Recommend

yes buy again

5.0

3 years ago

Claude

Bedford IN

Verified

Used on a new build

Would Recommend

The water pump was exactly right.

5.0

5 years ago

Herman

vernon texas

Verified

This was exactly what we were needing. Thanks.

Would Recommend

Pumps work and look good.

5.0

8 years ago

Motordr32

Beamsville Ontario Canada

Verified

I put these pumps on my 59A engine in my 32 Ford Coupe. Pulleys and belts all lined up perfectly. No leaks and using a 13# rad cap.

Would Recommend

great service

5.0

8 years ago

Mike

SAcramento Ca.

Verified

high quality part ,an improvement over originals

Would Recommend

I would always buy these pumps !

5.0

8 years ago

Xlr8er

Houston Tx

Verified

Speedway pumps are the best! Bill, knew what he was doing when he had these pumps designed. All bearing, better impeller. Can't say enough about them. Thank You for selling such a good product. Tom Teske ( classic car tech.)

Would Recommend

yes

5.0

8 years ago

N/A

Darlington, Pa

Verified

good quauity

Would Recommend

great

5.0

9 years ago

dick head

il.

Verified

great

Would Recommend

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Showing 10 of 20 reviews

Questions & Answers

7 Questions • 8 Answers

What radiator cap can I use with the pumps? Can I run a 16 pound cap

by Thomas

• 7 years ago

1 answer

View Answer

Would the 910-15593 pumps bolt up to a 1950 block, and could I change to an earlier crank pulley to line up the belt?

by Duecepkup

• 7 years ago

2 answers

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BY using the wide belt option I am assuming this is for use with an aftermarket 10SI or 12Sl alternator. But will that work with the stock Ford Flathead crank pulley?

by Tony

• 8 years ago

1 answer

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do these water pumps have ports for a heater hose? having trouble finding the correct lower heater hose adapter

by Mark

• 10 years ago

1 answer

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Do these pumps have a .75" or a .63 shaft? The listing says both details.

by FlatheadRonbo

• 11 years ago

1 answer

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What pressure cap will these water pumps operate ?

by Olds

• 11 years ago

1 answer

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Are the 49-53 and 37-48 interchageable?

by Larry

• 15 years ago

1 answer

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