Utilizes the original 4-ring design but incorporates modern manufacturing, .060" oversize Offenhauser 39-53 Flathead Ford 4-Ring Pistons, 4.00 Stroke/3.248 Bore Sku # 56042604 Mfr. Part # 56042604 Condition New Brand Offenhauser Sold Set 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 orMercury 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 .060" oversize.Sold in sets of eight.
Item Details3.248" bore, 4.00" stroke Specs Piston Style Flat Top Piston Material Cast Aluminum Piston Diameter 3.248" Stroke 4.000" Wrist Pin Included Yes MFG. Part # 56042604 Sold in Quantity Set Reviews I would buy again Rated by DAC on March 11, 2026
Summary: Pistons were great
Yes, I recommend this product.
very nice product Rated by Roger D on September 09, 2022
Summary: It is just a nice replacement
Yes, I recommend this product.
Perfect fit for .060" over with 4" stroke crankshaft. Rated by Prescott on June 22, 2022
Summary: Used on 1950 Mercury flathead bored .060" over with 4" stroke crankshaft.
Yes, I recommend this product.
I would buy this product again. Rated by None on February 11, 2022
Summary: Going in a 1934 5/W that was first hottrodded in the late 1950's.
Yes, I recommend this product.
Yes I would . Rated by Pickup. on June 23, 2020
Summary: They fit great and tolerance was perfect .
Yes, I recommend this product.
Related Items / Suggested Parts Rings for Offenhauser 4-Ring Flathead Ford Pistons, 3.248 bore Piston Ring Compressor Performance Tool W80524 Valve Lash Feeler Gauges 1939-53 Flathead Ford V8 4-Ring Pistons, 4 Inch Stroke, .060 Over Flathead Ford 4 Ring Set, 3.188 Bore, +.060 Oversize Tech Support We're here to help before and after your purchase. If you have a question or need assistance with one of our products, please contact us through Messaging and a knowledgeable Speedway Motors team member will be happy to help. About Speedway Motors is America’s Oldest Speed Shop® and has been a trusted source for specialty rodding and racing products and friendly expert advice for more than 74 years. Founded in 1952 by “Speedy” Bill Smith – a racer and street rodder himself – Speedway has grown from a one-man operation to become the world’s largest manufacturer, distributor and retailer of street rod and racing products. Our industry-leading fast delivery is the result of same-day shipping from our state-of-the-art, centrally located 500,000 sq. ft. headquarters. Speedway’s size offers customers unmatched product selection and low pricing, while our excellent technical support and customer service have made us a recognized leader in the rodding and racing industries.
