Clevite MS-590A-30 Engine Crankshaft Main Bearing Set

The Clevite MS-590A-30 is a precision-engineered main bearing set designed for high-performance and racing applications. This bearing set features advanced TriMetal construction that provides exceptional strength, durability, and protection under extreme operating conditions.

Key Features:

• TriMetal bearing construction for superior strength and wear resistance
• Optimized upper shell grooving design to maximize oil film thickness while ensuring adequate connecting rod lubrication
• High crush design for maximum retention in the bearing bore
• Reduced overlay thickness to prevent overlay fatigue and hen tracking
• Enlarged chamfers for improved crankshaft fillet clearance
• Non-flash plated back for better seating and improved heat transfer

Performance Series Information:

Clevite offers multiple bearing series to address specific performance needs. The P-Series features maximum eccentricity and full grooving for high oil flow, ideal for extreme RPM applications with severe rod bore distortion. The H-Series provides medium eccentricity with 180-degree upper grooving, making it the recommended starting point for most performance builds. The K-Series adds a proprietary moly/graphite TriArmor surface treatment for enhanced protection during start-up and high-load conditions. The V-Series uses lead-indium overlay for superior conformability, while the M-Series features thick babbitt lining for applications with severe crankshaft deflection.

Technical Advantages:

Modern bearing design has evolved to eliminate grooving from lower main shells, which significantly improves oil film thickness and bearing longevity. The upper shells retain optimized 180-degree grooving to supply oil to connecting rod bearings while maintaining maximum load capacity. This design provides the best balance of oil delivery and bearing durability for high-performance engines.

Each Clevite bearing set is manufactured to precise tolerances and undergoes rigorous quality control to ensure consistent performance. The hardened steel backing provides structural integrity while the carefully engineered overlay material protects against wear, embedment of debris, and bearing seizure.