ACL Bearings 8B663HN-001 Race Series Narrowed Rod Bearing Set

The ACL Bearings 8B663HN-001 is a Race Series performance narrowed connecting rod bearing set designed for Small Block Chevy and LS engine applications. This narrowed bearing set features narrowed bearing shells that provide additional edge clearance when running crankshafts with exceptionally large fillet radii, making it ideal for high-performance builds with modified crankshafts.

Key Features:

• High-performance tri-metal construction designed to withstand higher RPM conditions with a high-strength overlay plate featuring reduced thickness for improved fatigue properties
• 0.001" reduced clearance compared to standard H-series bearings (bearings are 0.0005" thicker per half)
• Manufactured to exacting tolerances with particular attention to wall thickness accuracy for reliable fit and consistent clearances
• Enlarged ID chamfers on bearing edges to accommodate large fillet radius on performance crankshafts
• No silvery tin flash applied to maximize heat transfer and prevent plate migration under high loading

Technical Specifications:

• Journal Size: 2.0990"-2.1000" (53.315-53.340mm)
• Tunnel Size: 2.2247"-2.2252" (56.507-56.520mm)
• Size: 0.001" reduced clearance
• Configuration: Narrowed design for large fillet radius crankshafts

ACL Race Series performance bearings are engineered for extreme endurance under harsh conditions with a unique combination of design, metallurgy, and engineering, making them the top choice for high-RPM performance and racing applications.