ACL Bearings 8B743A-20 Big Block Chevy Rod Bearing Set 0.020" Undersize

The ACL Bearings 8B743A-20 is a precision-engineered connecting rod bearing set designed for Big Block Chevrolet engines, including 396, 402, 427, and 454 cubic inch applications. This set features 0.020 inch (0.020") undersize bearings for use with crankshafts that have been ground to accommodate this undersize specification.

These bearings are part of ACL's A-Series Aluglide line, constructed from a proprietary composition of aluminum, tin, and silicon with a high-tensile steel backing. This advanced metallurgy provides the ideal balance of strength, wear resistance, and load-carrying capability required for both OEM replacement and performance engine builds. The bimetal aluminum construction offers exceptional anti-seizure properties, embeddability, and corrosion resistance.

Key Features:

• Application: Big Block Chevrolet V8 engines (396, 402, 427, 454 ci)
• Undersize: 0.020 inch undersize for reground crankshafts
• Material: Proprietary aluminum-tin-silicon alloy with steel backing
• Superior wear resistance and load-carrying capabilities
• Excellent thermal dissipation properties
• OEM-quality construction for reliable performance

ACL Bearings are trusted by engine builders worldwide for both street and performance applications. The A-Series Aluglide bearings provide a cost-effective, dependable solution that meets or exceeds original equipment specifications, making them ideal for engine rebuilds and performance upgrades.