Clevite MS-1061P-20 High Performance P-Series Main Bearing Set

The Clevite MS-1061P-20 is a high-performance main bearing set from the legendary P-Series line, engineered specifically for competition engines and extreme RPM applications. This main bearing set features full 360-degree grooving designed to maximize oil flow to connecting rod bearings, making it ideal for engines experiencing rod bearing oil starvation.

P-Series Performance Features:

• High eccentricity design to narrow bearing contact patterns and increase rod bearing lubrication
• High crush specification for maximum bearing retention in performance applications
• Reduced overlay thickness to prevent overlay fatigue and "hen tracking"
• Full groove configuration maximizes oil delivery to connecting rods
• Hardened steel backing provides added strength and fretting resistance
• TriMetal construction for superior durability under extreme loads

Optimal Bearing Oil Film Technology:

Clevite engineers have extensively tested main bearing groove configurations to optimize oil film development. The groove pattern in this bearing is specifically designed to supply adequate oil to connecting rods while maintaining the critical oil film that separates the bearing from the shaft surface during rotation. Unlike early full-grooved designs, modern Clevite main bearings balance oil delivery with oil film strength for maximum bearing life.

When to Use P-Series Main Bearings:

P-Series main bearings are recommended when higher eccentricity is needed to control bearing contact patterns, or when rod bearing oil starvation is evident (indicated by surface polishing, smearing, or discoloration concentrated at the bearing's axial center). These bearings excel in extreme RPM conditions where rod bore close-in causes excessive parting line contact with lower eccentricity bearings.

This bearing set represents decades of Clevite racing bearing development and is trusted by engine builders in NASCAR, drag racing, road racing, and other competition disciplines where bearing reliability is critical.