Sealed Power 5078M Engine Crankshaft Main Bearing Set

Ford 351W Main Bearing Set

The Sealed Power 5078M engine crankshaft main bearing set is built for Ford small block 351W applications from 1977-1998. It uses an overplated copper-lead alloy construction to support OE replacement service in a wide range of Ford, Mercury, and Lincoln vehicles.

For rebuilds on Ford F-150, F-250, Bronco, and related Windsor engine applications, this main bearing set provides the sizing options needed for standard and undersize service work. Sealed Power 5078M is a practical choice when restoring crankshaft support in high-mileage or freshly machined engines.

Key Features

• Engine crankshaft main bearing set for Ford 351W small block engines
• OE replacement coverage for 1977-1998 applications
• Overplated copper-lead alloy construction for durability in engine service
• Standard and undersize size options: Std, 1, 10, 20, 30, 40
• Fits Windsor engine applications across Ford, Mercury, and Lincoln platforms
• Sealed Power part number 5078M for rebuild and repair identification

Detailed Description

Sealed Power 5078M is an engine crankshaft main bearing set for Ford 351W Windsor small block engines. The overplated copper-lead alloy material is selected for main bearing service where consistent oil film support and crankshaft stability are required. This makes it a strong match for engine rebuilds in vehicles such as the Ford F-150, Ford Bronco, Ford F-250, and Mercury Grand Marquis when the application calls for a 351W main bearing set.

This part cross-references Sealed Power and related aftermarket listings for the same application, including 5M1432P and MS1432P. If you are searching for a Ford 351W main bearing set, Sealed Power 5078M is the catalog reference to verify against your engine machining and bearing size requirements.

What It Helps Fix

• Crankshaft main bearing wear in a Ford 351W engine
• Low oil pressure caused by excessive bearing clearance
• Engine knock or bearing noise from worn main bearings
• Damage found during a Windsor engine rebuild
• Fitment issues when replacing OE-style Ford main bearings

Installation Notes and Tips

• Confirm the engine is a Ford 351W Windsor small block before ordering.
• Match the bearing size to the crankshaft and block machining: standard or undersize as required.
• Measure journal clearance during assembly and verify oil passage alignment.
• Clean all bearing saddles and crankshaft journals before installation.
• Use the vehicle and engine build details to confirm fitment for Ford F-150, Bronco, F-250, and other listed applications.

Quality Assurance

Sealed Power parts are manufactured with modern materials and ISO- and QS-certified production processes to meet demanding engine service requirements. The 5078M main bearing set reflects that OE-replacement approach for Ford 351W rebuilds.