Clevite MS-1687P-30 High Performance Main Bearing Set

The Clevite MS-1687P-30 is a high-performance main bearing set engineered for demanding racing and performance engine applications. This bearing set utilizes Clevite's proven P-Series design, featuring optimized bearing geometry and advanced materials to handle extreme operating conditions.

P-Series Performance Features:

• Full groove upper bearing design maximizes oil flow to connecting rod bearings
• High crush design ensures maximum retention in high-RPM applications
• Reduced overlay thickness prevents overlay fatigue and "hen tracking"
• Hardened steel back construction provides added strength and fretting resistance
• Greater eccentricity helps narrow bearing contact patterns and increase rod bearing oiling
• TriMetal bearing construction for legendary durability and strength

Optimized Bearing Grooving:

This main bearing set features a 180-degree groove in the upper shell, which engineering testing has proven to be the optimal design for performance applications. The upper bearing groove efficiently supplies oil to the connecting rods while the ungrooved lower bearing maintains a thicker oil film for improved load capacity and bearing life. The lower bearing's smooth surface allows the crankshaft to ride on a continuous oil film, providing greater safety margins under extreme loads.

Ideal Applications:

P-Series main bearings are ideal for engines experiencing rod bearing oil starvation, indicated by polishing, smearing, or discoloration concentrated at the bearing's axial center. The full-groove design and higher eccentricity provide increased oil delivery to rod bearings in extreme high-RPM conditions. These bearings are designed for racing and high-performance street applications where maximum oil flow and retention are critical.

Clevite bearings are manufactured to exacting tolerances and are trusted by professional engine builders and racers worldwide for their consistency, durability, and performance under the most demanding conditions.