Clevite MS-1740P-.25MM Performance Main Bearing Set Undersize

The Clevite MS-1740P-.25MM is a high-performance main bearing set designed for competition and performance engines. This undersize bearing set (.25mm) is part of Clevite's renowned P-Series line, engineered specifically for extreme RPM applications where maximum oil flow and bearing retention are critical.

P-Series Performance Features:

• Full groove design maximizes oil flow to connecting rod bearings
• High crush construction ensures maximum retention in the bearing saddle
• Reduced overlay thickness prevents overlay fatigue and "hen tracking"
• Hardened steel back provides added strength and fretting resistance
• Increased eccentricity narrows bearing contact patterns for optimal performance
• TriMetal construction delivers legendary Clevite strength and durability

Engineered Bearing Groove Technology:

Clevite's optimized groove design ensures proper lubrication while maintaining critical oil film thickness. The upper main shells feature a 180-degree groove that effectively supplies oil to connecting rods without compromising bearing performance. Lower shells remain ungrooved to maximize oil film thickness and bearing life, providing the best balance of lubrication and load capacity.

Application Recommendations:

P-Series main bearings are ideal for high-RPM racing applications where rod bearing oil starvation is a concern. Use these bearings when you need higher eccentricity to narrow contact patterns or when maximum oil delivery to rod bearings is required. These bearings are particularly effective in addressing rod bearing polishing, smearing, or discoloration concentrated at the bearing's axial center—classic symptoms of inadequate lubrication.

The .25mm undersize specification is designed for use with crankshafts that have been ground undersize to restore proper bearing clearances. This bearing set provides the additional clearance needed for select fitting and optimal performance in rebuilt performance engines.