Clevite MS-804H High Performance Engine Crankshaft Main Bearing Set

The Clevite MS-804H is a high-performance engine crankshaft main bearing set designed for demanding racing and competition applications. Part of Clevite's renowned H-Series bearing line, this set features advanced engineering specifically developed for NASCAR-type racing and other high-stress motorsports environments.

H-Series Performance Features:

• Medium eccentricity design optimized for high RPM operation
• High crush construction ensures maximum bearing retention under extreme loads
• Hardened steel back provides superior strength and fretting resistance
• Thin overlay design prevents overlay fatigue and "hen tracking"
• Enlarged chamfers accommodate oversize crankshaft fillets
• Non-flash plated for improved bearing seating and contact
• Standard 180-degree upper shell grooving optimizes oil film development

Advanced Bearing Design:

Clevite's H-Series bearings utilize optimal grooving patterns based on extensive performance testing. The 180-degree groove in the upper main shell provides superior oil delivery to connecting rod bearings while maintaining maximum oil film thickness in the loaded lower bearing area. This design prevents the oil film disruption that occurs with full-groove or extended-groove patterns, resulting in improved bearing life and reduced friction losses.

Applications:

Ideal for medium to high RPM racing engines with oversize crankshaft fillets. The H-Series offers the perfect balance of eccentricity for most performance applications—use when contact patterns need to be broader than P-Series bearings provide. Optimal bearing contact should cover approximately two-thirds to three-quarters of the bearing surface for best results.

Built on Clevite's legendary TriMetal construction, the MS-804H delivers the durability and performance required for professional racing and serious enthusiast applications. When selecting performance bearings for the first time, the H-Series represents the ideal starting point for most builds.