Clevite MS-1428P-.75MM High Performance Main Bearing Set .75mm Undersize

The Clevite MS-1428P-.75MM is a high-performance engine crankshaft main bearing set designed for demanding performance and racing applications. This P-Series bearing set features .75mm undersize dimensions for use with reground crankshafts.

P-Series Performance Features:

• Full groove design in upper shells to maximize oil flow to connecting rod bearings
• High crush construction for maximum bearing retention under extreme conditions
• Reduced overlay thickness to prevent overlay fatigue and "hen tracking"
• Hardened steel back construction for added strength and fretting resistance
• Increased eccentricity to narrow bearing contact patterns and enhance rod oiling

Advanced Bearing Technology:

Clevite engineers have optimized main bearing groove design for performance engines. The 180-degree groove in the upper main shell provides the ideal balance of oil delivery to connecting rods while maintaining maximum oil film strength in critical load zones. The ungrooved lower shells deliver superior load capacity and extended bearing life by maintaining the thickest possible oil film.

When to Use P-Series Bearings:

P-Series main bearings are ideal for high-RPM racing engines experiencing severe rod bore distortion and close-in. These bearings excel in applications requiring maximum oil flow to prevent rod bearing oil starvation, which typically appears as surface polishing, smearing, or discoloration concentrated at the bearing's axial center. The higher eccentricity design creates optimal contact patterns covering 2/3 to 3/4 of the bearing surface.

This undersize bearing set is specifically manufactured for crankshafts that have been ground .75mm (approximately .030") undersize during reconditioning or performance machining.