Clevite MS-804P-20 Main Bearing Set - P-Series Performance

The Clevite MS-804P-20 is a high-performance main bearing set from the legendary Clevite 77 P-Series line. Engineered for serious performance and racing applications, this bearing set features full-groove design for maximum oil flow to connecting rod bearings, making it ideal for engines requiring optimal lubrication under extreme conditions.

P-Series Performance Features:

• High crush design for maximum bearing retention in performance applications
• Reduced overlay thickness to prevent overlay fatigue and "hen tracking"
• Full-groove upper shells to maximize oil delivery to rod bearings
• Hardened steel backing for added strength and fretting resistance
• Higher eccentricity to narrow bearing contact patterns and improve oiling
• Tri-Metal construction for legendary Clevite durability

When to Use P-Series Bearings:

P-Series main bearings are ideal for applications where increased oil flow to rod bearings is critical. Use these bearings when higher eccentricity is desired to narrow bearing contact patterns, or when rod bearing oil starvation has been an issue (indicated by polishing, smearing, or discoloration at the bearing center). The P-Series design helps prevent rod bearing failure in high-RPM applications where adequate oiling is essential for survival.

Engineering Notes:

Clevite's bearing groove technology is specifically designed to balance oil film strength with adequate rod bearing lubrication. The 180-degree groove in the upper main shell provides optimal oil delivery while maintaining maximum oil film thickness on the loaded lower shell. This design delivers superior bearing life compared to outdated full-groove or extended-groove designs that compromise oil film strength.

P-Series bearings represent Clevite's original high-performance bearing line and remain the preferred choice for applications requiring maximum oil flow and higher bearing eccentricity. These are distinct from standard passenger car bearings and feature unique core part numbers designed specifically for performance use.