Clevite MS-1038H-1 Engine Crankshaft Main Bearing Set

The Clevite MS-1038H-1 is a high-performance H-Series crankshaft main bearing set engineered for competition engines and demanding racing applications. This bearing set features 180-degree upper half grooving for optimal oil distribution to connecting rod bearings while maintaining maximum oil film strength in the loaded lower bearing shells.

H-Series Performance Features:

• Medium eccentricity design balances oil film development with proper contact patterns
• High crush construction ensures superior bearing retention under extreme loads
• Hardened steel backing provides exceptional strength and fretting resistance
• Thin overlay thickness prevents overlay fatigue and "hen tracking" in high-RPM applications
• Enlarged chamfers accommodate oversize crankshaft fillets common in performance crankshafts
• Non-flash plated for improved seating and heat transfer
• TriMetal construction with lead-tin-copper overlay for excellent wear resistance

Design Philosophy:

H-Series bearings were developed primarily for NASCAR-type racing but are suitable for all types of competition engines. The 180-degree upper shell grooving provides the best balance of oil supply to rod bearings while maintaining a thick, protective oil film in the heavily loaded lower bearing shells. This design prevents the film disruption that occurs with full-groove bearings while ensuring adequate lubrication throughout the engine.

Application Guidelines:

H-Series bearings are ideal for medium to high-RPM engines with performance crankshafts featuring oversize fillets. They work best when contact patterns cover approximately 2/3 to 3/4 of the bearing surface. If you're uncertain which performance bearing series to choose, H-Series bearings are the recommended starting point for most racing applications.

This main bearing set delivers the durability and oil film strength required for competition engines while providing proper lubrication to connecting rod bearings through optimized upper shell grooving.