Genuine Johnson SET-66 X2 Main Bearing Set (NORS)
This is a premium NORS (New Old Replacement Stock) Main Bearing Set manufactured by Johnson. Specifically engineered for the 226 cubic inch L-head inline-six engine family, this set provides precision fitment for 1946-1950 Kaiser and Frazer passenger cars, as well as Mack Truck EN12 and EN226 industrial engines. This application features a flanged front main bearing design, critical for proper thrust control and crankshaft alignment. Proudly made in the USA, these components are vital for restoring proper oil pressure and engine longevity in classic post-war Kaiser-Frazer and Mack builds. These bearings are finished to a .002" (X2) undersize, making them an excellent choice for addressing minor crankshaft journal wear or for precision bearing clearance adjustments in a professional-grade rebuild.
Key Features:
- Brand: Johnson
- Part Number: SET-66
- Interchange: TRW MS1133
- Position: Crankshaft Main Bearings
- Engine Fitment: 226 CID L6 (L-Head)
- Size: .002" Undersize (X2)
- Origin: USA
- Condition: NORS (New Old Replacement Stock)
Verified Vehicle Fitment:
| Make |
Model / Engine |
Year |
Engine |
Notes |
| Kaiser / Frazer |
All Models (Custom, Special, Manhattan) |
1946-1950 |
226 L6 |
Front Brg. Flanged; includes thrust washer |
| Mack Truck |
EN12 / EN226 Engines |
Vintage |
226 L6 |
Main Bearing Set |
| Willys / Jeep |
Super Hurricane (Utility Truck/Wagon) |
1954-Early |
226 L6 |
Fits models using flanged front main design |
Fits Years:
1946 1947 1948 1949 1950
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.
