Clevite MS-2253H-1 H-Series Main Bearing Set

The Clevite MS-2253H-1 is an H-Series engine crankshaft main bearing set designed for high-performance and competition engines. Developed primarily for NASCAR-type racing applications, these bearings deliver the durability and precision required for demanding motorsports environments.

H-Series Design Features:

• Medium level of eccentricity for optimal load distribution
• High crush construction for maximum bearing retention
• Hardened steel backing for increased strength
• Thin overlay coating to prevent overlay fatigue
• Enlarged chamfers for greater crankshaft fillet clearance
• No flash plating for improved bearing seating
• Standard 180-degree upper half grooving for proper oil distribution

Performance Benefits:

H-Series bearings feature a carefully engineered 180-degree groove design in the upper main shell that provides optimal oil flow to connecting rod bearings while maintaining maximum oil film thickness in the loaded lower bearing area. This design delivers superior bearing life compared to full-grooved designs by maintaining a thicker protective oil film where it's needed most.

Applications:

These bearings are ideal for engines with oversize crankshaft fillets and medium to high RPM operation. The H-Series is the recommended starting point for most performance applications, offering contact patterns that ideally cover 2/3 to 3/4 of the bearing surface for balanced load distribution.

Clevite H-Series bearings utilize proven TriMetal construction, combining a hardened steel back, aluminum-tin bearing material, and lead-tin-copper overlay for exceptional strength, conformability, and wear resistance in high-performance applications.