Clevite MS-1629AL-20 High Performance Main Bearing Set

The Clevite MS-1629AL-20 is a high-performance main bearing set engineered for competition and high-output engines. This bearing set features advanced TriMetal construction with optimized grooving design to maximize oil film strength while ensuring proper oil delivery to connecting rod bearings.

Key Features:

• TriMetal bearing construction for superior strength and durability
• Optimized 180-degree upper shell grooving for balanced oil flow and film thickness
• Ungrooved lower shells for maximum oil film development and bearing life
• High crush design for maximum bearing retention under severe loads
• Reduced overlay thickness to prevent overlay fatigue in high-performance applications
• Precision-engineered for consistent clearances and reliable performance

Engineering Design:

Clevite's engineering research demonstrates that the 180-degree groove in the upper main shell provides optimal performance by supplying adequate oil to connecting rod bearings while preserving oil film integrity in the loaded lower bearing half. This design maintains the thick oil film necessary for the crankshaft to hydroplane properly, reducing friction and extending bearing life under high loads and RPM.

Applications:

Ideal for performance street engines, racing applications, and rebuilds where maximum bearing reliability is required. The main bearing set is designed to handle the increased loads and RPM ranges typical of modified engines while providing the oil flow necessary to prevent rod bearing starvation.

Performance Series Guide:

Clevite offers multiple bearing series for specific applications. The P-Series features maximum eccentricity and full grooving for extreme RPM applications. H-Series bearings provide medium eccentricity with enlarged chamfers for oversized crankshaft fillets, making them the recommended starting point for most performance builds. K-Series (TriArmor) bearings add a proprietary moly/graphite surface treatment for enhanced protection. V-Series uses lead-indium overlay for improved conformability, while M-Series micro bearings feature thick babbitt lining for engines with severe crankshaft deflection.

Proper bearing selection depends on contact pattern analysis, RPM range, and specific engine characteristics. Contact patterns should ideally cover two-thirds to three-quarters of the bearing surface for optimal performance and longevity.