Clevite MS-429H-1 Engine Crankshaft Main Bearing Set

The Clevite MS-429H-1 is a high-performance H-Series crankshaft main bearing set engineered for competition and high-RPM applications. This bearing set features medium eccentricity, high crush for maximum retention, and a hardened steel back construction with thin overlay to prevent overlay fatigue. The upper bearing shells feature a standard 180-degree oil groove designed to optimize oil film thickness while providing adequate lubrication to connecting rod bearings.

Key Features:

• H-Series design with medium eccentricity for optimal bearing contact patterns
• High crush construction ensures superior bearing retention under extreme loads
• Thin overlay prevents fatigue and "hen tracking" in high-stress applications
• Enlarged chamfers provide increased crankshaft fillet clearance
• Non-flash plated for improved seating and conformability
• 180-degree upper shell grooving maximizes oil film development
• TriMetal construction delivers legendary Clevite strength and durability

Application Notes:

H-Series bearings are ideal for engines running in medium to high RPM ranges and crankshafts with oversize fillets. This design provides the best balance of oil film protection and bearing life for most performance applications. The 180-degree groove configuration develops a thicker oil film than fully-grooved designs, resulting in greater safety margins and improved bearing longevity. Contact patterns should ideally cover 2/3 to 3/4 of the bearing surface for optimal performance.

Originally developed for NASCAR competition, H-Series bearings are suitable for all types of racing engines and high-performance street applications. If you're uncertain which performance bearing series to choose, the H-Series bearing is the recommended starting point for most builds.