1939-53 Flathead Ford V8 4-Ring Pistons, 3-3/4 Stroke, .060 Over
1939-53 Flathead Ford V8 4-Ring Pistons, 3-3/4 Stroke, .060 Over
Speedway Motors

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#91015900

1939-53 Flathead Ford V8 4-Ring Pistons, 3-3/4 Stroke, .060 Over

  • Dome style
  • Will fit 1939-1953 Ford Flathead V8
  • Classic 4-ring design
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$158.99

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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
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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.
CA Prop 65
CARB warning

Speedway Motors 91015900 Specifications

KEY SPECS
MFG. Part #91015900
BrandSpeedway Motors
Piston StyleDome
Piston MaterialCast Aluminum
Wrist Pin IncludedYes
GENERAL
Piston Diameter3.248"
Stroke3.750"
Piston Weight470 grams
NotesCompression height is 1.729"
Sold in QuantitySet

Ratings & Reviews

5

3 Reviews

Overall Assessment

Customers highly value our product for its perfect and practical features. The pistons and rings are praised for their perfect fit and functionality. Many users recommend our product over others due to its quality and flawless performance. The material quality has often been referred to as second to none, contributing significantly to its practical usability and safety, specifically highlighted in a 1930 flathead roadster application. Unanimously, customers expressed their confidence in the product's superiority, demonstrating our product's competitive edge.

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5

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5.0

3 years ago

Spike

Shawano , Wisconsin

Verified

Can't say much about perfection !!!

Would Recommend

Incredible customer service!!!

5.0

4 years ago

Nick the Flathead

South Lyon, MI

Verified

While the pistons and rings worked perfectly and fit as described, 1 of the 2nd oil rings was missing. 1 ring out of 32 total rings was just absent. I called Speedway and asked if they could send me 1 ring. They had me a complete new set within 2 days. Amazing! Will never buy elsewhere. Thank you Speedway!

Would Recommend

Very pleased with my new pistons

5.0

6 years ago

Rusty

Branford Florida

Verified

used in my flathead 1930 roadster

Would Recommend

Showing 3 of 3 reviews

Questions & Answers

9 Questions • 13 Answers

I bought this piston.Part # 91015900 And I got piston ring Part # 56042620 But these combinations did not fit. Please tell me Which piston ring fits for this piston. Thanks

by johnny

• 6 years ago

1 answer

View Answer

I have just rebuilt my 8ba v8 motor with new 4 ring piston new will they any way in the bore OR are they one way only I think I may have put one in the wrong way don't want to pull it down again please help

by Welshy

• 7 years ago

2 answers

View Answers

The pistons look great and have the "060" stamped on them, though there is no arrow for a "left" or "right". Is there a set direction they should face or is the installation universal?

by Ronnie

• 7 years ago

1 answer

View Answer

I have purchased these pistons (nicely machined), though there is no paperwork provided. My Engine Builder has asked me to doublecheck the piston-bore clearance required and measured from which part of the piston? Any help appreciated.

by Ronnie

• 8 years ago

3 answers

View Answers

what is the wall clearance that is recommended for these pistons?

by Fredric

• 13 years ago

1 answer

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How much do the piston and wrist pin weigh?

by distributorguy

• 13 years ago

1 answer

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is the third or 4th groove the oil ring groove and is there a front and back to these pistons

by

• 14 years ago

1 answer

View Answer

Are the pistons flat top or dome and how tall is the dome. And what is the ring groove thickness. Thanks

by

• 14 years ago

2 answers

View Answers

hi can you tell me where are they made ? USA ?

by

• 14 years ago

1 answer

View Answer

9 of 9 questions shown

Fitment

  • 239 Ford Flathead V8

  • 221 Ford Flathead V8

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  • 221 Ford Flathead V8

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  • 239 Ford Flathead V8

  • 239 Ford Flathead V8

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