Product Summary

Dome Piston Style, Cast Aluminum Piston Material

  • Dome style
  • Will fit 1939-1953 Ford Flathead V8
  • Classic 4-ring design
  • Steel wrist pins
  • Precision ground

Key Specs

MFG. Part #91015900
BrandSpeedway Motors
Piston StyleDome
Piston MaterialCast Aluminum
Wrist Pin IncludedYes

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Speedway Motors 91015900 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 have modern steel wrist pins with real snap rings. They’re a great upgrade when rebuilding your 1939-1953 flathead Ford or Mercury V8 engine.

Sizing based on original 3.188" bore. Fits .060" overbore size and 3.75" stroke crank. Sold as a set of 8.

  • 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

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.

Speedway Motors 91015900 Specifications

MFG. Part #91015900
BrandSpeedway Motors
Piston StyleDome
Piston MaterialCast Aluminum
Wrist Pin IncludedYes
Piston Diameter3.248"
Piston Weight470 grams
NotesCompression height is 1.729"
Sold in QuantitySet