Clevite MS-1038H-20 High Performance Main Bearing Set H-Series

The Clevite MS-1038H-20 is a high-performance main bearing set from the acclaimed H-Series line, engineered specifically for competition engines and high-RPM applications. Developed primarily for NASCAR-type racing, these bearings deliver the durability and precision demanded by professional engine builders and serious racers.

H-Series Performance Features:

• Medium eccentricity design optimized for broad performance applications
• High crush construction for maximum bearing retention under extreme loads
• Hardened steel backing provides exceptional strength and fretting resistance
• Thin overlay design prevents overlay fatigue and "hen tracking"
• Enlarged chamfers accommodate oversized crankshaft fillets
• No flash plating for improved seating and heat transfer
• Standard 180-degree upper shell grooving for optimal oil distribution

Engineering Excellence:

The H-Series design represents the ideal balance between oil film development and bearing longevity. The 180-degree groove in the upper main shell supplies oil to connecting rod bearings while maintaining maximum oil film thickness in the loaded lower bearing area. This configuration delivers superior load capacity compared to fully-grooved designs while preventing oil starvation at the connecting rods.

Application Guidelines:

H-Series bearings are the recommended starting point for most performance builds. Use these bearings with crankshafts featuring oversize fillets and in engines operating in medium to high RPM ranges. Contact patterns should ideally cover two-thirds to three-quarters of the bearing surface. If patterns obtained with P-Series bearings are too narrow, H-Series bearings provide the proper solution.

Built on Clevite's legendary TriMetal construction, the MS-1038H-20 delivers professional-grade reliability for racing, marine, and high-performance street applications.