Clevite MS-115P-20 P-Series High Performance Main Bearing Set

The Clevite 77 MS-115P-20 is a high-performance main bearing set from the legendary P-Series line, engineered specifically for racing and high-RPM applications. These bearings feature full 360-degree grooving to maximize oil flow to connecting rod bearings, making them ideal for engines experiencing rod bearing oil starvation or requiring increased lubrication capacity.

Key Features:

• Full groove design delivers maximum oil flow to connecting rods under extreme conditions
• High crush construction ensures maximum bearing retention in the bore
• Reduced overlay thickness prevents overlay fatigue and "hen tracking"
• Hardened steel back provides added strength and resistance to fretting
• Greater eccentricity narrows bearing contact patterns for improved performance
• Tri-Metal construction combines durability with excellent load-bearing capacity

Recommended Applications:

• Engines experiencing rod bearing oil starvation (indicated by polishing, smearing, or discoloration)
• Extremely high RPM applications causing severe rod bore distortion
• Performance builds requiring higher eccentricity to optimize contact patterns
• Racing engines needing maximum oil delivery to connecting rod bearings

The P-Series represents the original line of Clevite high-performance bearings, proven through decades of competition use. These bearings are designed for serious performance applications where maximum oiling capacity and bearing retention are critical. The full groove design provides insurance against rod bearing failure in high-stress conditions, though it may slightly reduce the oil film thickness on the upper main shell compared to 180-degree grooved designs.

Important Note: P-Series bearings feature greater eccentricity than H-Series or standard bearings. If bearing contact patterns are too narrow (less than 2/3 of bearing surface), consider stepping down to H-Series bearings for your application.