Clevite MS-1625P-20 P-Series Performance Main Bearing Set

The Clevite MS-1625P-20 is a high-performance main bearing set from the legendary P-Series line, designed for serious racing and performance engine applications. This bearing set features advanced engineering to maximize durability and oil delivery in demanding high-RPM environments.

P-Series Performance Features:

• High eccentricity design to optimize bearing contact patterns and reduce concentrated loads
• Full groove configuration in upper shells maximizes oil flow to connecting rod bearings
• High crush specification ensures maximum retention in performance blocks
• Reduced overlay thickness prevents overlay fatigue (hen tracking) under racing conditions
• Hardened steel backing provides superior strength and fretting resistance
• No flash plating for improved bearing seating during installation

Engineering and Design:

Clevite's bearing groove technology is carefully engineered to balance oil delivery with bearing performance. The 180-degree groove in the upper main shell provides optimal oil supply to the connecting rods while maintaining the thickest possible oil film on both upper and lower bearing surfaces. The ungrooved lower shells develop maximum film thickness for superior load capacity and bearing life under racing conditions.

Recommended Applications:

P-Series main bearings are ideal for high-RPM engines experiencing severe rod bore distortion, particularly in drag racing and extreme performance applications. These bearings excel when increased oil delivery to the rod bearings is critical, often indicated by polishing, smearing, or discoloration at the center of rod bearings. The higher eccentricity design produces narrower, more concentrated contact patterns compared to H-Series bearings, making them suitable for engines where extreme loads demand focused bearing support.

This bearing set utilizes Clevite's proven TriMetal construction with lead-tin-copper overlay for exceptional strength, durability, and wear resistance in competition environments.