Product Description
Genuine Federal Mogul 4671M-20 Main Bearing Set (NORS)
This genuine Federal Mogul 4671M-20 Main Bearing Set is a premium New Old Replacement Stock (NORS) component, specifically engineered for the heavy-duty Inline 6-cylinder engine family used by Minneapolis-Moline, Oliver, and Waukesha. Manufactured in the USA, this .020" undersize set provides the essential oil clearance and high-load durability required for a precision rebuild of displacements including the 283, 310, and 320 cubic inch power plants (4.6L to 5.2L). This set is a critical requirement for professional engine restorations where the crankshaft journals have been professionally turned to .020" undersize, ensuring proper rotational alignment and optimal oil pressure for long-term reliability in demanding agricultural and industrial applications.
Key Features:
- Brand: Federal Mogul
- Part Number: 4671M-20
- Position: Crankshaft Main Bearings
- Size: .020" Undersize
- Engine Fitment: M-M / Oliver / Waukesha 283 / 310 / 320 L6
- Standard Journal Diameter: 2.6240" / 2.6250"
- Origin: Made in the USA
- Condition: NORS (New Old Replacement Stock)
Verified Engine Application Breakout:
| Make / Engine Family | Displacement | Cylinders | Notes |
|---|---|---|---|
| Minneapolis-Moline | 283 ci / 310 ci | Inline 6 | G-Series / 425A-6A |
| Oliver | 283 ci / 310 ci | Inline 6 | 1800 / 1850 / 1950 (Early) |
| Waukesha | 283 / 310 / 320 | Inline 6 | 180 / 185 / 190 Series |
Fits Years:
1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979
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.
