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  3. FORD 8RT-6421

FORD 8RT-6421 Nos Flathead Flywheel Housing Seal Retainer 239 V8

fits make: Ford. year: 1948-52.

8rt-6421 Ford Nos 1948-52 Truck 239 V8 Flathead Flywheel Housing Seal Retainer

( Manufacturer Part Number: 8RT-6421 ), ( Part Type: Seal Flywheel Housing ), ( Vintage Part: Yes )

Review FORD Nos Truck 239 V8 Flathead Flywheel Housing Seal Retainer fits 1948-52

Ford 8RT-6421 NOS (New Old Stock) Flathead Flywheel Housing Seal Retainer for Ford V8 Engines (1948-1952)

Description:

This is an authentic, original Ford 8RT-6421 Flathead Flywheel Housing Seal Retainer, newly-unboxed and in its original packaging. Manufactured by Ford Motor Company, this part is specifically designed for Ford flathead V8 engines, produced between the years 1948 and 1952.

The seal retainer is a critical component of the flywheel housing assembly, responsible for retaining the flywheel housing gasket and sealing the connection between the engine block and the flywheel housing. Its precise design ensures a perfect seal, which is essential for maintaining engine performance and preventing the loss of engine fluids.

The 8RT-6421 is made from high-quality materials, engineered to withstand the rigors of continuous operation in a high-heat environment. Its durable construction ensures long-lasting performance and reliability, making it an invaluable addition to any Ford flathead V8 engine restoration project.

This part is in the form of a flat, circular ring with multiple mounting bosses and a central hole to accommodate the crankshaft. It is designed to be installed from the engine side of the flywheel housing.

This New Old Stock (NOS) part has never been used, ensuring that it is in its original condition and free from any signs of wear or damage. It comes in its original packaging, which includes all necessary paperwork and instructions for installation.

By installing this genuine Ford 8RT-6421 Flathead Flywheel Housing Seal Retainer, you can restore your Ford flathead V8 engine to its original factory specifications, ensuring optimal performance and reliability. Whether you are restoring a classic car or simply maintaining your vintage Ford engine, this part is an essential addition to your toolkit.

Specifications:

- Manufacturer: Ford Motor Company

- Part Number: 8RT-6421

- Application: Ford flathead V8 engines (1948-1952)

- Material: High-quality engineered materials

- Condition: New Old Stock (NOS)

- Includes: Original packaging and instructions.

Buying a Ford 8N-6421 NOS Flywheel Housing Seal Retainer (1948-1952 239 V8 Flathead) - Pros, Cons, and Conclusion

The Ford 8N-6421 NOS (New Old Stock) Flywheel Housing Seal Retainer is a critical part for 1948-1952 239 V8 Flathead engines. Let's discuss the potential advantages and disadvantages of purchasing this part:

Pros:

1. Authenticity: Buying a new old stock part guarantees that the component is original and has not been used before. This can be essential for collectors and restorers who want to maintain the originality of their vehicles.

2. Quality: New old stock parts are known for their high quality. They are often manufactured using the same methods and materials as the original parts, ensuring a perfect fit and reliable performance.

3. Durability: Since the part is new, it will not have the wear and tear that comes with used components. This can save time and money in the long run, as the part may not need to be replaced as frequently.

Cons:

1. Cost: New old stock parts can be more expensive than their used counterparts. The price difference can be significant, especially for less common parts like the Ford 8N-6421 Flywheel Housing Seal Retainer.

2. Availability: NOS parts may not be readily available from local auto parts stores or even online retailers. Collectors and restorers might need to search extensively to find the part they need.

3. Shipping Costs: Since NOS parts are often sourced from specialized dealers or collectors, the shipping costs can be higher than standard auto parts.

Conclusion:

The decision to buy a Ford 8N-6421 NOS Flywheel Housing Seal Retainer depends on the specific needs and priorities of the buyer. For collectors and restorers who value authenticity and high quality, the advantages of purchasing a new old stock part may outweigh the cons. On the other hand, for those who are budget-conscious or prioritize convenience, a used part might be a more practical choice. Ultimately, it is essential to consider the unique requirements of the project and weigh the pros and cons carefully before making a decision.

Recommendation:

If you are a collector or restorer who wants to maintain the originality and quality of your 1948-1952 239 V8 Flathead engine, a Ford 8N-6421 NOS Flywheel Housing Seal Retainer may be the right choice for you. However, if you are working on a budget or prefer the convenience of a readily available part, a used Ford 8N-6421 Flywheel Housing Seal Retainer might be a more practical option. Before making a decision, research various suppliers and compare prices, availability, and shipping costs to ensure you get the best deal and the part that best fits your needs.

Details:

See photos for best. Fits 1948-52 Ford 239 CI flathead trucks. May fit others, please verify fitment prior to purchase. Numbers cast on the inside of retainer: 8RT-6421.

NOS Ford flywheel housing seal retainer with seals. Hand-written numbers on the front of retainer are: 8RT-6410.

part #: 8rt6421 prices

  • $15.00-$105.00

specifications othellodrivetrain:

  • for makes: Ford
  • for years: 1948-52
  • mpn: 8rt-6421
  • part type: Seal Flywheel Housing
  • vintage part: Yes

payments othellodrivetrain:

  • wallet: Paypal
  • other
  • credit card: Visa

general othellodrivetrain:

  • condition: Remanufactured
  • Car Truck Parts Accessories > Transmission Drivetrain > Other Transmission Drivetrain

seller othellodrivetrain:

  • rating: 100.0%
  • # reviews: 829
  • city: Edwards, California

offer othellodrivetrain:

  • availability: In Stock
  • best offers: True
  • quantity: 1
  • sold: 0
  • options: Ship-to-home
  • started: November 15, 2025

returns othellodrivetrain:

  • policy: No Returns

shipping othellodrivetrain:

  • cost: $10.02
  • transit: 4-9 Days
  • type: Calculated
  • class: Standard, Expedited, Economy
  • carrier: USPS, UPS
  • service: USPS Ground Advantage, USPS Priority Mail, UPS Ground Saver
for makes: ford, for years: 1948-52, part type: seal flywheel housing, vintage part: yes,
category: auto parts > car truck parts accessories > transmission drivetrain, sku: 10625093996058502,

Ford 8RT-6421 Is Similar To:

othellodrivetrain logo
3 offers $15.00–$105.00 USD
  • Offer #1: $79.95 price + $9.85 shipping estimate = $89.80* total. PART # NOS OEM 1948-52 FORD TRUCK239 V8 FLATHEAD FLYWHEEL HOUSING SEAL RETAINER.+$9.85 shipping
  • Offer #2: $105.00 price + $20.90 shipping estimate = $125.90* total. Hard to find item. Condition is used.+$20.90 shipping
  • Offer #3: $15.00 price + $13.50 shipping estimate = $28.50* total.+$13.50 shipping

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