Perfect Circle MS590H1 H-Series Main Bearing Set Small Block Ford .001 Oversize

The Perfect Circle MS590H1 is a high-performance H-Series main bearing set designed for Small Block Ford engines including 289 and 302 cubic inch V8 applications. This set features .001 inch oversize clearance (extra clearance) for use with standard size crankshafts, making it ideal for performance applications where additional oil clearance is desired.

Key Features:

• Tri-metal construction with babbitt outer layer, copper-lead alloy intermediate layer, and precision hardened steel backing
• Medium level of eccentricity with high crush factor for secure retention
• Enlarged chamfers at bearing sides for improved crankshaft fillet clearance
• Manufactured without flash plating for superior bearing seating
• 1/2 groove design for optimized oil distribution
• Capable of handling loads up to 12,000 PSI

Originally developed for NASCAR racing applications, H-Series bearings are well-suited for all types of high-performance and competition engines, particularly those operating in the medium-to-high RPM range. The thin overlay design combined with the hardened steel back provides excellent durability and load capacity for demanding performance applications.