Clevite MS-979A-10 High Performance Crankshaft Main Bearing Set

The Clevite MS-979A-10 is a high-performance engine crankshaft main bearing set engineered for demanding racing and performance applications. This bearing set features Clevite's proven tri-metal construction, designed to provide optimal load capacity, durability, and oil film retention under extreme operating conditions.

Advanced Bearing Design:

Clevite's engineering approach focuses on maximizing oil film thickness for superior bearing protection. The upper main shells feature an optimized 180-degree oil groove that effectively supplies oil to connecting rod bearings while maintaining critical oil film integrity. The lower shells are ungrooved, allowing the crankshaft to develop the thickest possible oil film for maximum safety margin and extended bearing life. This design reduces peak oil film pressure and minimizes parasitic horsepower loss compared to fully-grooved configurations.

Series Features:

• Tri-metal construction with steel backing for exceptional strength
• Optimized eccentricity for proper load distribution and contact patterns
• High crush design ensures maximum bearing retention
• Reduced overlay thickness prevents overlay fatigue
• Enlarged chamfers provide increased crankshaft fillet clearance
• Non-flash plated for improved bearing seating

Performance Series Options:

Clevite offers multiple bearing series to address specific engine requirements. P-Series bearings feature maximum eccentricity and full grooving 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, making them ideal for NASCAR and general competition use with medium to high RPM operation. K-Series (TriArmor) bearings incorporate a proprietary moly/graphite surface treatment for enhanced wear protection during startup and high-load conditions. V-Series bearings utilize lead-indium overlay for superior conformability. M-Series (Micro bearings) feature thick babbitt lining on hardened steel backing for extreme conformability in engines experiencing severe crankshaft deflection.

Application Guidelines:

Select bearing series based on your specific engine requirements. For general high-performance use with oversize crankshaft fillets, H-Series bearings provide an excellent starting point. If experiencing narrow contact patterns, choose bearings with higher eccentricity. Ideal bearing contact patterns should cover approximately 2/3 to 3/4 of the bearing surface. Extra clearance options are available in select series for precision fitting and accommodating shaft variations.

This main bearing set is designed for professional engine builders and serious racers who demand maximum reliability and performance from their engine's rotating assembly.