ACL Race Series Conrod Bearing Set (0.020" Undersize), Chevrolet Big Block — 8B743H-020

Precision undersize fitment and ultimate fatigue resistance for high-output Chevrolet Big Block V8 builds. When rebuilding or machining a ground crankshaft on a performance Chevy big block, maintaining exact oil clearances is critical for high-RPM reliability. The ACL Race Series Conrod Bearing Set (8B743H-020) features a 0.020-inch (0.50mm) undersize specification, specifically engineered to withstand severe cylinder pressures, heavy loads, and motorsport applications.

Vehicle & Engine Applications

Designed for ground crank journals requiring a 0.020" (0.50mm) undersize on Chevrolet Big Block V8 engines:

• Chevrolet Big Block (BBC): 366 ci, 396 ci, 402 ci, 427 ci, and 454 ci V8 engines
• Common Fitments: Muscle car restorations, drag racing, marine performance applications, and heavy-duty truck builds (Chevy C10, Chevelle, Camaro)

Key Specifications

• Part Number: 8B743H-020
• Crankshaft Undersize: 0.020 in / 0.50 mm
• Bearing Type: Big End / Conrod Bearing Set
• Material: High-performance Tri-metal construction

Kit Contents

• 1x Complete Engine Set of ACL Race Series Conrod Bearings (0.020" Undersize)

Rebuilding your Chevy Big Block bottom end? Drop our team a message if you need assistance verifying journal measurements or matching main bearings for your build.