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

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#91015903

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

  • Original 4-ring design
  • Pressure cast aluminum construction provides great strength and durability
  • Precision cam ground
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$434.99

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Product Summary

Flat Top Piston Style, Cast Aluminum Piston Material

  • 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
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Key Specs

MFG. Part #91015903
BrandSpeedway Motors
Piston StyleFlat Top
Piston MaterialCast Aluminum
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Speedway Motors 91015903 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 4" 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 91015903 Specifications

KEY SPECS
MFG. Part #91015903
BrandSpeedway Motors
Piston StyleFlat Top
Piston MaterialCast Aluminum
GENERAL
Piston Diameter3.313"
Stroke4.000"
Sold in QuantitySet

Questions & Answers

2 Questions • 2 Answers

I purchased these pistons for building my 8ba. I did not see a spec sheet for piston to wall clearence. Does the manufacturer have a spec on this?

by GM

• 2 years ago

1 answer

View Answer

what kind of advantage does this piston have over the pistons with a kind of groove on it for swirl or squish

by saurabh

• 15 years ago

1 answer

View Answer

2 of 2 questions shown

Fitment

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