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Offenhauser 39-53 Flathead Ford 4-Ring Pistons, 3.75 Stroke/3.248 Bore

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Specs
Sold in Quantity:
Set
Piston Diameter:
3.248
Stroke:
3.75
Piston Weight:
468
Piston Style:
Flat Top
Dome Height:
1.729
Piston Material:
Cast Aluminum
Garage Sale:
No
Offenhauser 39-53 Flathead Ford 4-Ring Pistons, 3.75 Stroke/3.248 Bore
Offenhauser 39-53 Flathead Ford 4-Ring Pistons, 3.75 Stroke/3.248 Bore
Offenhauser 39-53 Flathead Ford 4-Ring Pistons, 3.75 Stroke/3.248 Bore

Click image to enlarge

Please NOTE the following about this product:

  • This item is sold as a set.

Details

Reviews

Q & A

What's in the Box

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.

The original bore size was 3.188", which makes these .060" oversize. Sold in sets of eight.

  • 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

Item Details

3.248" bore, 3.75" stroke

Customer Reviews

Rated 5 out of 5 by 1 reviewers.
RATING BREAKDOWN
1 reviews
5 Stars
1
4 Stars
0
3 Stars
0
2 Stars
0
1 Star
0
RECOMMEND THIS PRODUCT:

Pete's Rod Shop
Rochester, OH

Specs are all "right on"

April 25, 2010
I have not installed the pistons yet, but they all mic'ed nicely.
Yes, I recommend this product.
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Was this review helpful? 0 0

Page 1 of 1

Product Q&A

3 questions : 3 answers

1 answers

wrist pins is it center of or shift ?

henri
September 15, 2013

wrist pins is it center of or shift ?

Answers

September 16, 2013
Jason
The wrist-pins in these pistons are centered, so there is NO "left" or "right" to them.
1 answers

Are the pistons flat top or dome and how tall is the dome? And how much do the piston and wrist pin weigh?

Fredric
Sweden
June 11, 2013

Are the pistons flat top or dome and how tall is the dome? And how much do the piston and wrist pin weigh?

Answers

June 12, 2013
Jason
This offenhauser piston has a dome shape and a 1.729" compression height. The piston and pin weighs 468 grams
1 answers

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

Mackman
Houston,TX
April 25, 2011

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

Answers

April 27, 2011
Jason
.0015” - .002” minimum
Page 1 of 1

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1939-53 Flathead Ford V8 4-Ring Pistons, 3-3/4 Stroke, .060 Over
(Part #91015900)
                        

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.

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
Arias Forged Flathead Ford Pistons, 3.75 Stroke
(Part #14528070)
                        

If you are going to spend the time and money to build the flathead of your dreams, you just as well spring for Arias forged pistons. Arias forgings work great with nitrous and up to 10 psi on blown engines. They come as a set of eight and include wrist pins, locks and piston rings. They are a three ring design and work with the stock 7" rod length. Stock flathead bore size was 3.188"

Each piston set includes:

  • (8) Forged Aluminum Pistons
  • (8) Wrist Pins w/ Locks
  • (8) Cast Ring Sets

Item Details

Comp. Height - 1.561"
Rings for Offenhauser 4-Ring Flathead Ford Pistons, 3.248 bore
(Part #56042620)
                        

The original bore size was 3.188", which makes these .060" oversize.

Instructions (PDF) 

 

Flathead Ford 4 Ring Set, 3.188 Bore, +.060 Oversize
(Part #91015904)
                        

Fits 3.188" bore Speedway Custom 4 Ring Pistons for Flathead V8.  Set of 8.  Cast Iron top and 2nd groove rings.

+.060" oversize.  Oversizes based off original 3.188" bore size.

Ford Flathead V8 Builders Handbook
(Part #91085211)
                        This book covers every facet of your Flathead Ford V-8. Rebuilding? Get one of these books! 200 images. 154 pages.