Clevite MS-667P Engine Crankshaft Main Bearing Set

The Clevite MS-667P is a high-performance engine crankshaft main bearing set designed for demanding automotive applications. This precision-engineered bearing set features Clevite's proven TriMetal construction, delivering exceptional durability and reliability under extreme operating conditions.

Key Features:

• TriMetal bearing construction for superior strength and wear resistance
• Optimized 180-degree upper shell grooving for maximum oil film development
• High crush design ensures excellent bearing retention
• Reduced overlay thickness prevents overlay fatigue and hen tracking
• Hardened steel backing provides added structural strength
• Enlarged chamfers for improved crankshaft fillet clearance
• Non-flash plated for superior bearing seat contact

Performance Design:

Clevite engineers have developed this bearing set with careful attention to oil film dynamics. The upper shell features a 180-degree groove that provides optimal lubrication to connecting rod bearings while maintaining the thickest possible oil film on the crankshaft journal. Lower shells remain ungrooved to maximize load-carrying capacity and bearing life. This design creates a greater safety margin compared to older full-grooved bearing designs.

Application Notes:

This bearing set is ideal for performance and racing engines operating across medium to high RPM ranges. The bearing's eccentricity and contact pattern characteristics are engineered to prevent oil starvation while maintaining proper shaft support. Installation requires proper clearance measurement and torque specifications per engine manufacturer guidelines.

Construction Benefits:

The TriMetal construction combines a hardened steel backing layer with a copper-lead intermediate layer and a lead-tin-copper overlay. This combination delivers excellent conformability to minor shaft irregularities while maintaining the structural rigidity needed for high-performance applications. The reduced overlay thickness specifically addresses the demands of racing engines where elevated temperatures and loads can cause premature overlay failure.