Offenhauser 39-53 Flathead Ford 4-Ring Pistons, 3.75 Stroke/3.313 Bore
Offenhauser 39-53 Flathead Ford 4-Ring Pistons, 3.75 Stroke/3.313 Bore
Offenhauser

|

#56042602

Offenhauser 39-53 Flathead Ford 4-Ring Pistons, 3.75 Stroke/3.313 Bore

  • Utilizes the original 4-ring design but incorporates modern manufacturing
  • .125" oversize
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Bore/Stroke:

3.313" Bore / 3.75" Stroke

3.248" Bore / 3.75" Stroke3.248" Bore / 4.00" Stroke

$176.99

/set

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Product Summary

Flat Top Piston Style, Cast Aluminum Piston Material

  • Utilizes the original 4-ring design but incorporates modern manufacturing
  • .125" oversize
See more details

Key Specs

MFG. Part #56042602
BrandOffenhauser
Piston StyleFlat Top
Piston MaterialCast Aluminum
Wrist Pin IncludedYes
See more specs

Need To Know

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855.313.9176
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Offenhauser 56042602 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

The original bore size was 3.188", which makes these .125" oversize. Sold in sets of eight.

Item Details

3.313" bore, 3.75" stroke

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

Offenhauser 56042602 Specifications

KEY SPECS
MFG. Part #56042602
BrandOffenhauser
Piston StyleFlat Top
Piston MaterialCast Aluminum
Wrist Pin IncludedYes
GENERAL
Piston Diameter3.313"
Stroke3.750"
Sold in QuantitySet

Ratings & Reviews

4.8

5 Reviews

Overall Assessment

Customers praise our product for its superior quality, good fit, and aesthetic appeal, setting it apart from the competition. They find it worth buying again due to its reasonable price. The easy assembly of the pistons and pins highlight its practicality and usability, reinforcing the great quality and value it offers. Overall, customer recommendations reflect positive satisfaction with the product, reinforcing its standout performance. The positive reviews allude to its high material quality which promotes longevity and safety.

Write A Review

4.8

5 reviews

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4.0

3 years ago

67goingthing

Dix, IL

Verified

Great quality

Would Recommend

Look Great, I would buy again

5.0

6 years ago

TD

McMinnville, TN

Verified

I haven't got the motor running yet, however, the pistons and pins assembled easily with good fit.

Would Recommend

i would buy this product again

5.0

7 years ago

QC

Concord NC

Verified

reasonable price!

Would Recommend

great service and good product

5.0

9 years ago

col

nsw australia

Verified

very happy with service

Would Recommend

Good looking pistons

5.0

10 years ago

Stink-bug

USA

Verified

Great parts.

Would Recommend

Showing 5 of 5 reviews

Questions & Answers

5 Questions • 5 Answers

Do you this pistons in a standart diameter measures?

by FERN

• 9 years ago

1 answer

View Answer

I'd like to know if the piston pins are offset or in the center.

by John

• 10 years ago

1 answer

View Answer

I purchased the 4 ring pistons and rings and am wondering where the expander type oil rings with the thin rails go, the 4th ring groove or the 3rd. They fit in either groove but seem to be best in the third with the wide cast ring in the fourth. The ring instruction sheet didn't cover 4 ring Pistons. Thanks for any info

by Rob

• 10 years ago

1 answer

View Answer

What is different from these pistons and the Speedway brand?

by Swiss

• 11 years ago

1 answer

View Answer

I am rebuilding a '46 Ford Flathead. What is the recommended piston to cylinder wall clearance ? .125" oversize Offenhauser pistons (4 ring style) with Isky 77-B cam, Offy heads and Tripple manifold. Also need to get "end gap" spec on piston rings. My old "Motors Manual" is very sketchy on actual "measurement"

by Hemi Al

• 11 years ago

1 answer

View Answer

5 of 5 questions shown

Fitment

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