Clevite MS-558P High Performance Engine Crankshaft Main Bearing Set

The Clevite MS-558P is a high-performance engine crankshaft main bearing set designed for demanding racing and performance applications. This precision-engineered bearing set utilizes Clevite's proven TriMetal construction to deliver exceptional durability and reliability under extreme operating conditions.

Advanced Bearing Design:

Clevite's engineering research has demonstrated that a 180-degree groove in the upper main shell provides optimal bearing performance. This design maximizes oil film thickness in the loaded lower bearing while maintaining adequate oil supply to the connecting rods. The upper shells feature strategic grooving to feed oil to the connecting rods, while the ungrooved lower shells maintain a thicker oil film for improved load capacity and extended bearing life.

P-Series Performance Features:

• High eccentricity design for optimized load distribution and bearing contact patterns
• Full groove configuration maximizes oil flow to rod bearings
• High crush specifications ensure maximum bearing retention in the block
• Reduced overlay thickness prevents overlay fatigue and "hen tracking"
• Hardened steel backing provides added strength and fretting resistance
• Ideal for applications experiencing rod bearing oil starvation or requiring increased oil delivery

Performance Applications:

The P-Series bearing design is specifically engineered for extreme RPM applications where severe rod bore distortion causes close-in conditions. These bearings are the ideal choice when higher eccentricity is needed to narrow bearing contact patterns and increase oil supply to connecting rod bearings. They excel in racing engines and high-performance builds where maximum oil flow and bearing retention are critical.

Technical Specifications:

• TriMetal construction with steel backing
• Lead-tin-copper overlay for excellent wear resistance
• Precision-manufactured to tight tolerances
• No flash plating for improved bearing seating
• Compatible with performance crankshafts

This bearing set represents Clevite's legacy of providing professional-grade engine components trusted by engine builders and racers worldwide. The MS-558P delivers the durability and performance characteristics needed for serious competition engines and high-output street applications.