Perfect Circle MS429H Main Bearing Set Small Block Chevy - 265 283 302 327

The Perfect Circle MS429H is a high-performance main bearing set designed for small block Chevrolet V8 engines from 1955-1967, including 265, 283, 302, and 327 cubic inch displacements. This bearing set is part of the H-Series line, engineered specifically for racing and high-performance applications.

Key Features:

• H-Series performance design with tri-metal construction for superior strength and durability
• Standard size bearings with half-groove oil distribution pattern
• Hardened steel backing with carefully selected overlay and high crush factor
• Medium level of eccentricity optimized for medium-to-high RPM operation
• Enlarged chamfers for greater crankshaft fillet clearance
• Manufactured without flash plating for improved seating characteristics
• Designed for small journal crankshaft applications

Originally developed for NASCAR racing, these H-Series main bearings are well-suited for various competition engines and performance builds. The tri-metal construction reduces drag and increases horsepower while withstanding high loads. Perfect Circle is now part of the Clevite MAHLE family, ensuring the same quality and performance standards trusted by professional engine builders for decades.