Product Description
Genuine Michigan R1126P Engine Main Bearings (NORS)
This listing is for a New Old Replacement Stock (NORS) Michigan R1126P engine main bearing set, manufactured by Detroit Aluminum and Brass Corp. These precision-engineered components are designed to support the crankshaft within the engine block of first-generation Oldsmobile Rocket V8 engines. The ".020" designation indicates these bearings are 0.020 inches undersize, intended for crankshaft journals that have been professionally machined during an engine rebuild. This is a partial set, servicing the non-thrust main journals (Positions 1-4) of your Oldsmobile Rocket V8.
⚠️ CRUCIAL REBUILDER'S APPLICATION WARNING
This package is a factory-configured PARTIAL main bearing kit. It does NOT include the rear main thrust bearing shell (Position 5). To complete a full engine assembly, you must purchase 1 Pair of Part No. 7343 CAP separately.
Additionally, this kit will NOT fit 1964–1990 second-generation Oldsmobile engines (such as the 307, 330, 350, 400, 425, or 455 V8), because GM moved the thrust bearing to position 4 on those blocks. Fits crankshaft main journals professionally machined to .020" Undersize only.
Key Features:
- Brand: Michigan Engine Bearings (Detroit Aluminum and Brass Corp.)
- Part Number: R 1126 P .020
- Position: Crankshaft Main Bearings (Partial Set - Non-Thrust Journals Only)
- Size: .020" Undersize (.020 U.S.)
- Set Quantity: 4 Pairs Total (Services 4 of the 5 total main journals)
- Individual Component Breakdown inside Box: 1x Pair Part No. 7342 CAP (Position 1 / Front Main), 3x Pairs Part No. 7561 CAP (Positions 2, 3, and 4 / Intermediates)
- Origin: Made in USA
- Condition: NORS (New Old Replacement Stock)
Fitment:
| Make | Model | Year | Engine | Notes |
|---|---|---|---|---|
| Oldsmobile | Eighty-Eight (88) / Super 88 / Ninety-Eight (98) / Deluxe 88 / Futuramic | 1949–1953 | 303 CID "Rocket" V8 | PARTIAL SET; Includes journals 1–4; requires separate position 5 thrust bearing (7343 CAP) |
| Oldsmobile | Super 88 / Ninety-Eight (98) / Starfire | 1954–1956 | 324 CID "Rocket" V8 | PARTIAL SET; Includes journals 1–4; requires separate position 5 thrust bearing (7343 CAP) |
| Oldsmobile | Super 88 / Dynamic 88 / Ninety-Eight (98) | 1957–1960 | 371 CID "Rocket" V8 | PARTIAL SET; Includes journals 1–4; requires separate position 5 thrust bearing (7343 CAP) |
| Oldsmobile | Dynamic 88 / Super 88 / Starfire / 98 | 1959–1964 | 394 CID "Rocket" V8 | PARTIAL SET; .020" Undersize |
Fits Years:
1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964
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 our fitment data using vintage manufacturer catalogs to provide you with the most accurate information possible. However, because we are human and these decades-old resources can occasionally contain errors, we cannot guarantee 100% accuracy. We strongly encourage you to perform your own due diligence and verify this part number for your specific application before purchasing. Please note that this part may also fit other vehicles or years not explicitly listed in our research.
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.
