Clevite MS306P Main Bearing Set High Performance P-Series

The Clevite MS306P is a high-performance main bearing set from the P-Series line, engineered specifically for extreme RPM racing applications and performance engines requiring maximum oil flow to connecting rod bearings.

P-Series Performance Features:

• Full groove design maximizes oil delivery to rod bearings
• High crush construction ensures maximum bearing retention
• Reduced overlay thickness prevents overlay fatigue and hen tracking
• TriMetal construction with hardened steel backing for superior strength
• High eccentricity design narrows bearing contact patterns
• Engineered for engines experiencing severe rod bore close-in at extreme RPM

Advanced Bearing Technology:

Unlike standard automotive bearings, the MS306P features full 360-degree grooving in the main shells to prevent rod bearing oil starvation—a critical concern in high-performance applications. The bearing design incorporates a 180-degree groove in the upper shell for optimal oil film development while maintaining maximum oil supply to connecting rods. The reduced overlay thickness combats fatigue under racing conditions, while the high crush design prevents bearing rotation even under extreme loads.

Application Notes:

P-Series main bearings are ideal for racing engines where rod bearing oil starvation is evident through surface polishing, smearing, or discoloration concentrated at the bearing's axial center. The higher eccentricity design creates narrower contact patterns compared to H-Series bearings, making them suitable for engines running extremely high RPM where severe rod bore distortion occurs. Contact patterns should ideally cover 2/3 to 3/4 of the bearing surface for optimal performance.

The MS306P main bearing set maintains the film of oil essential for proper bearing operation while ensuring adequate lubrication reaches the connecting rod bearings—balancing the dual requirements of main bearing protection and rod bearing oil supply in demanding performance applications.