Clevite MS-2253H High Performance Main Bearing Set H-Series

The Clevite MS-2253H is a high-performance engine crankshaft main bearing set from the H-Series line, designed specifically for competition engines and NASCAR-type racing applications. This bearing set features medium eccentricity, high crush retention, and a hardened steel back with thin overlay construction for maximum durability under extreme operating conditions.

H-Series Performance Features:

• Medium level of eccentricity optimized for balanced contact patterns covering 2/3 to 3/4 of bearing surface
• High crush design ensures superior bearing retention in high-RPM applications
• Hardened steel backing provides exceptional strength and fretting resistance
• Thin overlay construction prevents overlay fatigue and "hen tracking"
• Enlarged chamfers provide greater crankshaft fillet clearance for aftermarket and modified crankshafts
• Non-flash plated for improved bearing seating and initial break-in
• Standard 180-degree upper half grooving optimizes oil film thickness while maintaining proper rod bearing lubrication

Advanced Bearing Design:

The upper main shells feature a 180-degree oil groove that provides the ideal balance between connecting rod lubrication and oil film development. This design has been extensively tested and proven superior to both shorter grooves and extended grooves that compromise bearing performance. The lower shells are ungrooved, allowing the crankshaft to develop a thicker, more stable oil film for improved load capacity and bearing life.

Applications and Benefits:

H-Series bearings are the recommended starting point for most high-performance and racing engine builds. They excel in medium to high RPM applications and work particularly well with crankshafts featuring oversized fillets. The tri-metal construction provides excellent strength and durability, while the optimized eccentricity prevents the overly narrow contact patterns sometimes seen with P-Series bearings. If you're building a competition engine and aren't certain which performance bearing series to choose, H-Series bearings offer the best all-around performance characteristics.

This main bearing set is engineered to handle the extreme loads and temperatures found in racing environments while maintaining the oil film separation critical to bearing survival. The combination of high crush, medium eccentricity, and enlarged chamfers makes the MS-2253H an excellent choice for serious performance applications.