ACL Bearings 8B634AO/S2-40 Connecting Rod Bearing Set Ford 289 302 V8 .040 Undersize

The ACL Bearings 8B634AO/S2-40 is a high-performance connecting rod bearing set engineered for Ford small block V8 engines, including 255, 289, and 302 cubic inch variants from 1962-1998. This precision-manufactured bearing set features ACL's advanced Aluglide construction with special overlay for superior durability and performance in demanding applications.

Key Features:

• Aluglide aluminum alloy construction with proprietary overlay coating for enhanced seizure resistance
• .040 inch (1.0mm) undersize for reground crankshafts
• S2 select-fit specification for precise oil clearance control
• Tri-metal construction with copper-lead-tin lining for excellent fatigue strength
• High-tensile steel backing for superior strength and dimensional stability
• Precision machined surface with optimized eccentricity for bore distortion compensation
• Enhanced bearing retention through improved radial contact pressure
• Compatible with Ford Windsor small block engines from the 1960s through 1990s

ACL Race Series bearings are recognized throughout the motorsports industry for their exceptional durability and performance under extreme conditions. The Aluglide overlay provides low-friction operation and excellent embedability, while the tri-metal construction ensures the fatigue strength needed for high-performance and racing applications. These bearings are ideal for engine rebuilds requiring undersize bearings due to crankshaft regrinding.