Clevite MS-1265P-20 P-Series High Performance Main Bearing Set

The Clevite MS-1265P-20 is a high-performance main bearing set from the legendary P-Series line, engineered specifically for demanding racing and performance engine applications. This bearing set features the proven TriMetal construction that has made Clevite the trusted choice of engine builders worldwide.

P-Series Performance Features:

• Full groove design maximizes oil flow to connecting rod bearings
• High crush design ensures maximum bearing retention under extreme loads
• 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 optimal performance
• TriMetal construction delivers superior durability and wear resistance

Engineered for Extreme Conditions:

P-Series main bearings are specifically designed for engines experiencing extremely high RPMs that cause severe rod bore distortion. The full groove configuration ensures consistent oil delivery to rod bearings, preventing oil starvation that can lead to bearing failure. This design is ideal when rod bearing polishing, smearing, or discoloration indicates insufficient lubrication.

Advanced Bearing Technology:

The upper main shells feature a 180-degree groove that provides optimal oil distribution while maintaining maximum bearing support. This design has been proven through extensive testing to deliver the best balance of lubrication and load capacity. The reduced overlay thickness enhances durability in high-stress racing applications where bearing fatigue is a concern.

When to Choose P-Series:

Select P-Series main bearings when your application demands maximum oil flow to rod bearings, particularly in high-RPM racing engines. These bearings are the ideal choice when bearing analysis shows rod oil starvation or when you need the higher eccentricity design to achieve proper contact patterns. P-Series represents the foundation of Clevite's performance bearing lineup, with decades of proven success in professional racing.

Each bearing set is precision-manufactured to strict tolerances and designed for use with standard or performance crankshafts. Clevite's reputation for quality and consistency makes these bearings a reliable choice for professional engine builders and serious racers.