Clevite MS1687P Main Bearing Set High Performance P-Series

The Clevite MS1687P is a high-performance main bearing set designed for racing and performance engine applications. This P-Series bearing set features full-groove upper shells to maximize oil flow to connecting rod bearings, along with high crush for maximum retention in demanding applications.

P-Series Performance Design:

• Full-grooved upper main shells for maximum oil delivery to rod bearings
• High crush design ensures superior bearing retention under extreme conditions
• Reduced overlay thickness prevents overlay fatigue and "hen tracking"
• Hardened steel backing provides added strength and fretting resistance
• Higher eccentricity narrows bearing contact patterns and increases rod bearing oiling

Advanced Tri-Metal Construction:

Clevite's legendary Tri-Metal bearing design combines a hardened steel back with a copper-lead intermediate layer and a lead-tin-copper overlay. This proven construction delivers exceptional strength, conformability, and wear resistance for high-performance and racing applications.

Applications and Benefits:

P-Series main bearings are ideal for engines experiencing rod bearing oil starvation, typically indicated by polishing, smearing, or discoloration concentrated at the bearing's axial center. The full-groove design ensures consistent oil supply to connecting rods even under extreme RPM and load conditions. These bearings are engineered for maximum durability in competition engines where bearing retention and oil flow are critical.

This main bearing set represents Clevite's oldest and most proven high-performance bearing series, trusted by engine builders and racers for decades of competition success.