1939-53 Flathead Ford V8 4-Ring Pistons, 3-3/4 Stroke, .125 Over
1939-53 Flathead Ford V8 4-Ring Pistons, 3-3/4 Stroke, .125 Over
Speedway Motors

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#91015901

1939-53 Flathead Ford V8 4-Ring Pistons, 3-3/4 Stroke, .125 Over

  • Made from premium cast aluminum to ensure long life and durability
  • Feature a four-ring design, are cam ground and use modern steel wrist pins and real snap rings
  • Great upgrade when rebuilding your 1939-1953 flathead Ford or Mercury V8 engine
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$171.99

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Product Summary

Flat Top Piston Style, Cast Aluminum Piston Material

  • Made from premium cast aluminum to ensure long life and durability
  • Feature a four-ring design, are cam ground and use modern steel wrist pins and real snap rings
  • Great upgrade when rebuilding your 1939-1953 flathead Ford or Mercury V8 engine
  • Fits .125" overbore size and 3.75" stroke crank
  • Sold as a set of 8
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Key Specs

MFG. Part #91015901
BrandSpeedway Motors
Piston StyleFlat Top
Piston MaterialCast Aluminum
Wrist Pin IncludedYes
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Speedway Motors 91015901 Details

Original flathead pistons used four rings, were somewhat round, had questionable wrist pins and locks and were made of cast iron. These pressure-cast aluminum pistons share the four-ring design, but are cam ground and use modern steel wrist pins and real snap rings. They’re a great upgrade when rebuilding your 1939-1953 flathead Ford or Mercury V8 engine.

  • Original 4-ring design
  • Pressure cast aluminum construction provides great strength and durability
  • Precision cam ground
  • Modern steel wrist pins
  • Snap ring style retainer clips

Sizing based on original 3.188" bore. Fits .125" overbore size and 3.75" stroke crank. Sold as a set of 8.

CARB Warning

For race/ off road use or for use on pre-1966 vehicles.

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.
CA Prop 65
CARB warning

Speedway Motors 91015901 Specifications

KEY SPECS
MFG. Part #91015901
BrandSpeedway Motors
Piston StyleFlat Top
Piston MaterialCast Aluminum
Wrist Pin IncludedYes
GENERAL
Piston Diameter3.313"
Stroke3.750"
Sold in QuantitySet

Ratings & Reviews

5

2 Reviews

Overall Assessment

Customers highly appreciate the product for its exact clearance which enhances the product usability. Its top-notch material quality ensures superb performance in V8 engine rebuilds. The product stands out in the competition for its reliability and accuracy, prompting customers to recommend our product repeatedly.

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5

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Happy to deal with Speedway again

5.0

4 years ago

Fordhavendave

Christchurch, New Zealand

Verified

Flathead V8 rebuild

Would Recommend

pistons

5.0

10 years ago

frog

ga

Verified

clearances are right on the money

Would Recommend

Showing 2 of 2 reviews

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Fitment

  • 239 Ford Flathead V8

  • 221 Ford Flathead V8

  • 239 Ford Flathead V8

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  • 239 Ford Flathead V8

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  • 239 Ford Flathead V8

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  • 337 Ford Flathead V8

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  • 255 Ford Flathead V8

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  • 239 Ford Flathead V8

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  • 221 Ford Flathead V8

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  • 337 Ford Flathead V8

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  • 255 Ford Flathead V8

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  • 255 Ford Flathead V8

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  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

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  • 221 Ford Flathead V8

  • 239 Ford Flathead V8

  • 239 Ford Flathead V8

  • 239 Ford Flathead V8

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