Perfect Circle MS1266HG H-Series Main Bearing Set 5-Piece Standard

The Perfect Circle MS1266HG is a high-performance crankshaft main bearing set designed for Chrysler, Dodge, and Plymouth 360 cubic inch (5.9L) V8 engines. Part of the H-Series performance bearing line originally developed for NASCAR racing, this bearing set delivers exceptional reliability for competition and high-performance street applications.

Key Features:

• H-Series performance design with medium eccentricity and high crush factor for optimal engine protection
• Hardened steel backing with carefully selected thin overlay for superior strength
• Enlarged chamfers at bearing sides provide greater crankshaft fillet clearance
• Manufactured without flash plating for improved seating and heat transfer
• Cast copper-lead construction offers approximately 20% greater fatigue strength than sintered alternatives
• Full groove design with 360-degree oil distribution
• Standard size bearings for stock crankshaft journals
• Made in USA

These bearings are specifically engineered for engines with oversize crankshaft fillets that operate in medium to high RPM ranges. The H-Series design provides the durability needed for demanding performance applications while maintaining the precision required for reliable operation. Ideal for engine rebuilds, performance upgrades, and racing applications.