Product Description
Genuine Federal Mogul 4300M-20 Main Bearing Set (NORS)
This genuine Federal Mogul 4300M-20 Main Bearing Set is a premium New Old Replacement Stock (NORS) component, specifically engineered for the early production runs of the Ford 240 cubic inch (3.9L) and 300 cubic inch (4.9L) inline 6-cylinder engines. Manufactured in the USA, this set is distinguished by its 3.370" flange diameter, a specification unique to the 1965 and 1966 model years. Featuring a .020" undersize, these bearings are a critical requirement for professional engine restorations where the crankshaft journals have been professionally turned to achieve exact tolerances. This set ensures original equipment levels of oil clearance and high-load durability, providing proper rotational alignment and optimal oil pressure for long-term reliability in your vintage Ford truck or van.
Key Features:
- Brand: Federal Mogul
- Part Number: 4300M-20
- Position: Crankshaft Main Bearings
- Size: .020" Undersize
- Engine Fitment: Ford 240 / 300 Inline 6 (Early Design)
- Flange Diameter: 3.370"
- Origin: Made in the USA
- Condition: NORS (New Old Replacement Stock)
Verified Vehicle Fitment:
| Make | Model | Year | Engine | Notes |
|---|---|---|---|---|
| Ford | F-Series / Econoline | 1965-1966 | 240ci L6 (3.9L) | 3.370" Flange O.D. |
| Ford | F-Series / Econoline | 1965-1966 | 300ci L6 (4.9L) | 3.370" Flange O.D. |
Fits Years:
1965 1966
Note on Stock Photos: Due to our inventory of multiple identical units for this specific part number, we utilize representative stock photos for this listing. You will receive a component that strictly meets all listed specifications and fitment requirements. Please be aware that because these are vintage parts, minor cosmetic variations—such as surface finish, color, or production markings—may exist between different manufacturing runs. These slight aesthetic differences are a result of historical production processes and do not impact the part's integrity, performance, or authenticity.
A Note on Fitment Accuracy: We manually research and cross-reference our fitment data using vintage manufacturer catalogs. While we strive for 100% accuracy, these decades-old resources—and the humans reading them—can occasionally contain errors. Additionally, these parts may fit other vehicles and years not explicitly listed in our data. To ensure a seamless restoration, we kindly ask that you perform your own due diligence and verify that this specific part number is correct for your application prior to purchase.
Unbeatable Prices & Expectations
While many of our vintage parts were manufactured decades ago, they remain unused and high-quality. Some original boxes may show signs of shelf-wear, such as dust, tape, or surface distress from years of storage. Rest assured, the components inside have been inspected to ensure they are complete and ready to help you finish your project without breaking the bank.
