Clevite MS-1804P-.50MM High Performance Main Bearing Set Undersize

The Clevite MS-1804P-.50MM is a high-performance main bearing set featuring P-Series construction designed for demanding racing and competition applications. This undersize bearing set (.50mm) is engineered for engines requiring maximum oil flow and superior retention characteristics under extreme operating conditions.

P-Series Performance Features:

• Full groove design maximizes oil flow to connecting rod bearings
• High crush construction ensures maximum bearing retention in the housing
• Reduced overlay thickness prevents overlay fatigue and "hen tracking"
• Hardened steel backing provides exceptional strength and fretting resistance
• Higher eccentricity narrows bearing contact patterns for improved performance
• Engineered for extremely high RPM applications where severe rod bore deformation occurs

Advanced Bearing Technology:

Clevite P-Series main bearings utilize a 180-degree groove in the upper shell to provide optimal oil supply to connecting rods while maintaining the thickest possible oil film for superior bearing protection. The upper shell grooving delivers essential lubrication without compromising the loaded lower shell, which remains ungrooved for maximum load-carrying capacity and extended service life.

Ideal Applications:

Use this P-Series main bearing set when rod bearing oil starvation is evident (indicated by polishing, smearing, or discoloration at the bearing center), or when engines operate at sustained high RPM where increased oil delivery to rod bearings is critical. The higher eccentricity design is particularly effective for narrowing bearing contact patterns and preventing rod bearing failure in severe duty racing applications.

This bearing set features Clevite's legendary TriMetal construction with lead-tin-copper overlay, providing the optimal balance of strength, conformability, and wear resistance for professional racing and high-performance street applications.