Clevite MS-1752P-.25MM High Performance Main Bearing Set .25mm Undersize

The Clevite MS-1752P-.25MM is a high-performance main bearing set designed for demanding applications. This .25mm undersize bearing set features advanced TriMetal construction that provides exceptional strength and durability for racing and performance engines.

P-Series Performance Design:

This P-Series main bearing set is engineered specifically for high-performance and competition engines. Key features include full groove design in the upper shells to maximize oil flow to connecting rod bearings, high crush for maximum retention in the block, and reduced overlay thickness to prevent overlay fatigue. The bearings utilize a hardened steel back for added strength and resistance to fretting, making them ideal for extreme operating conditions.

Advanced Bearing Technology:

Clevite engineers have optimized the main bearing groove design through extensive testing. The 180-degree groove in the upper main shell provides the best overall performance, delivering oil to the connecting rods while maintaining optimal oil film thickness on the loaded lower shells. This design ensures proper lubrication while maximizing bearing life and load capacity.

When to Use P-Series Bearings:

• Engines operating at extremely high RPMs that cause severe rod bore distortion
• Applications requiring higher eccentricity to narrow bearing contact patterns
• Situations where increased oil flow to rod bearings is needed
• Competition engines experiencing rod bearing oil starvation
• Performance builds requiring maximum bearing retention

Technical Specifications:

• Undersize: .25mm (0.010 inch) undersize for refinished crankshafts
• Construction: TriMetal design with hardened steel back
• Overlay: Reduced thickness lead-tin-copper overlay
• Groove Pattern: Full 360-degree grooving for maximum oil delivery
• Crush: High crush design for superior retention
• Application: Performance and racing engines

P-Series bearings are the ideal choice when rod bearing oil starvation is indicated by polishing, smearing, or discoloration concentrated at the bearing's axial center. The high eccentricity design helps prevent rod bore close-in conditions while ensuring adequate lubrication throughout the engine.