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

The Clevite MS-2253HX is a high-performance H-Series main bearing set designed for competitive racing and high-RPM applications. Featuring a 180-degree upper shell oil groove design, this bearing set provides optimal oil film thickness while ensuring adequate connecting rod lubrication. The H-Series construction delivers the ideal balance between bearing durability and performance for demanding engine builds.

H-Series Performance Features:

• Medium eccentricity design for optimal load distribution and contact patterns
• High crush for maximum retention in performance applications
• Hardened steel back construction for exceptional strength
• Thin overlay thickness to prevent overlay fatigue
• Enlarged chamfers for increased crankshaft fillet clearance
• No flash plating for improved seating characteristics
• Standard 180-degree upper half grooving for balanced oil delivery
• HX suffix indicates 0.001" extra clearance for precise fitment

Engineered for Demanding Applications:

Originally developed for NASCAR competition, H-Series bearings excel in all types of racing engines operating in medium to high RPM ranges. The tri-metal construction combines a hardened steel back with a performance-optimized overlay system, delivering superior strength and durability under extreme loads. These bearings are manufactured without flash plating to ensure proper seating and maximum contact with the engine block.

Optimal Bearing Design:

The 180-degree groove configuration in the upper main shell represents the most effective design for performance engines. This grooving provides essential oil supply to connecting rod bearings while maintaining the thickest possible oil film in the loaded lower bearing area. The upper shells handle lower loads and retain the groove for rod oiling, while ungrooved lower shells develop maximum oil film thickness for improved safety margins and extended bearing life.

When to Choose H-Series:

H-Series bearings are ideal for engines with oversize crankshaft fillets and medium to high RPM operation. If you're unsure which performance bearing series to select, H-Series offers the best starting point for most performance builds. These bearings work best when contact patterns cover approximately two-thirds to three-quarters of the bearing surface, indicating proper load distribution.

Extra Clearance Advantage:

The HX designation indicates this set includes an additional 0.001" clearance beyond standard specifications, allowing for precise select-fitting and accommodation of slightly oversized journals or thermal expansion in high-performance applications.