Perfect Circle MS909H9 Engine Main Bearing Set Small Block Chevy .009 Undersize

The Perfect Circle MS909H9 is a high-performance engine main bearing set designed for small block Chevrolet V8 engines including 262, 267, 302, 305, 307, 327, and 350 cubic inch displacements manufactured between 1968-2002. This set features .009 inch undersize bearings, specifically engineered for crankshafts that have been ground oversize.

Key Features:

• H-Series tri-metal construction with hardened steel backing and thin overlay for superior durability
• Medium level of eccentricity with high crush factor for optimal performance
• Enlarged chamfers at bearing edges provide greater crankshaft fillet clearance
• Made without flash plating for improved seating and contact with bearing housing
• 1/2 groove design for effective oil distribution
• .009 inch undersize compensates for crankshafts ground larger than standard

H-Series bearings were originally developed for NASCAR racing applications but are well-suited for any high-performance or competition engine. These bearings excel in medium-to-high RPM applications and work best with crankshafts featuring oversize fillets. The tri-metal construction combines strength with wear resistance, while the carefully selected overlay material ensures reliable performance under demanding conditions.