Clevite MS-1344A-10 Engine Crankshaft Main Bearing Set

The Clevite MS-1344A-10 is a precision-engineered crankshaft main bearing set designed for performance and racing applications. This high-performance bearing set provides critical support and lubrication for the crankshaft while ensuring optimal oil delivery to connecting rod bearings.

Key Features:

• TriMetal bearing construction with hardened steel backing for maximum strength and durability
• Optimized 180-degree upper shell grooving for superior oil film development and rod bearing lubrication
• High crush design ensures maximum bearing retention under extreme conditions
• Reduced overlay thickness prevents overlay fatigue and "hen tracking" in high-stress applications
• Ungrooved lower shells maximize oil film thickness for improved load capacity and bearing life
• Precision-manufactured to strict tolerances for consistent performance

Engineering and Design:

Clevite's advanced bearing design focuses on maintaining a critical oil film between the bearing surface and crankshaft. The upper main shells feature a 180-degree groove that effectively supplies oil to connecting rod bearings while maintaining optimal oil film pressure in the loaded bearing area. The ungrooved lower shells, which experience higher loads, retain a thicker oil film for improved safety margins and extended bearing life. This configuration has been proven through extensive testing to provide the best balance of lubrication and load capacity for performance engines.

Performance Series Options:

Clevite offers multiple bearing series for different performance applications. P-Series bearings feature maximum eccentricity and full-groove designs for applications requiring increased oil flow to rod bearings, particularly where rod bearing oil starvation is a concern. H-Series bearings provide medium eccentricity with enlarged chamfers for crankshafts with oversized fillets, making them ideal for NASCAR and general competition use. K-Series (TriArmor) bearings incorporate a proprietary moly/graphite coating for enhanced protection during start-up and high-load conditions. V-Series bearings utilize lead-indium overlay for superior conformability. M-Series (Micro) bearings feature a thin babbitt lining on hardened steel for extreme conformability in applications with severe crankshaft deflection.

Application Notes:

Select your bearing series based on engine RPM range, crankshaft fillet size, and bearing contact pattern requirements. Ideal contact patterns should cover two-thirds to three-quarters of the bearing surface. Extra clearance variants are available in most series for select fitting and applications requiring additional clearance. H-Series bearings are recommended as the starting point for most performance applications when optimal bearing series is uncertain.

This main bearing set is engineered for engines requiring reliable performance under high RPM and elevated load conditions, making it suitable for racing, high-performance street applications, and demanding powersports use.