Product Description
Genuine Federal Mogul 4420M-20 Main Bearing Set (NORS)
This genuine Federal Mogul 4420M-20 Main Bearing Set is a premium New Old Replacement Stock (NORS) component, specifically engineered for the legendary Ford FE Big Block V8 engine family. Manufactured in the USA, this .020" undersize set features the 3.930" flange diameter, which is the correct specification for heavy-duty and late-production FE series blocks. Designed for displacements including the 332, 352, 360, 361, 390, 391, 406, 410, 427, and 428, these bearings provide the essential oil clearance and high-load durability required for a precision rebuild. 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 your vintage Ford or Mercury power plant.
Key Features:
- Brand: Federal Mogul
- Part Number: 4420M-20
- Position: Crankshaft Main Bearings
- Size: .020" Undersize
- Engine Fitment: Ford FE V8 (Late / Heavy Duty Series)
- Flange Diameter: 3.930"
- Origin: Made in the USA
- Condition: NORS (New Old Replacement Stock)
Verified Vehicle Fitment:
| Make | Engine Size | Year Range | Engine Family | Notes |
|---|---|---|---|---|
| Ford / Mercury | 332, 352, 360, 390 | 1958-1976 | FE V8 | 3.930" Flange O.D. |
| Ford / Mercury | 406, 410, 427, 428 | 1961-1970 | FE V8 | .020" Undersize Journal |
| Ford Truck | 330, 359, 361, 389, 391 | 1964-1978 | FT / FE V8 | Heavy Duty Applications |
Fits Years:
1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978
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.
