Clevite MS-2007A-.50MM Oversize Main Bearing Set

The Clevite MS-2007A-.50MM is a precision-engineered engine crankshaft main bearing set designed for performance and racing applications. This bearing set features .50mm (.020") oversize dimensions to accommodate machined crankshafts, providing the critical oil film separation needed for high-performance engine builds.

Engineering and Design:

• TriMetal construction combining a steel backing with precision-engineered bearing material and overlay for optimal strength and durability
• 180-degree upper shell groove design optimizes oil delivery to connecting rod bearings while maintaining maximum oil film thickness
• Ungrooved lower shells provide thicker oil film for improved load capacity and bearing life
• High crush design ensures maximum bearing retention in the saddle
• Reduced overlay thickness prevents overlay fatigue and "hen tracking" in demanding applications
• Enlarged chamfers provide clearance for oversize crankshaft fillets
• Non-flash plated backing promotes better bearing seating

Performance Applications:

This main bearing set is engineered for engines experiencing high loads, elevated RPM operation, and performance modifications. The optimized groove configuration ensures adequate oil supply to connecting rod bearings while maximizing the load-carrying capacity of the main bearings themselves. The .50mm oversize dimension is designed for crankshafts that have been ground .50mm undersize on the main journals.

Technical Advantages:

• Hardened steel backing provides exceptional strength and resistance to fretting
• Medium eccentricity design balances oil film development with bearing contact patterns
• Precision overlay thickness optimized for high-load performance applications
• Compatible with both OEM and aftermarket performance crankshafts

Clevite main bearing sets are developed using extensive research into oil film dynamics, bearing load distribution, and real-world racing data. The 180-degree upper groove design has been validated to provide the optimal balance between rod oiling and main bearing protection, avoiding the performance penalties of full-groove or extended-groove designs.