ACL Race Series Main Bearing Set (0.001" Undersize), Chevrolet Big Block — 5M829H-001

Precision clearance management and ultimate durability for Chevrolet Big Block performance builds. When building or rebuilding a high-output Chevy big block, maintaining exact oil clearances on a ground crank is critical. The ACL Race Series Main Bearing Set (5M829H-001) features a 0.001-inch undersize specification, engineered to deliver exceptional load-bearing capacity, fatigue resistance, and seizure protection under heavy RPM loads.

Vehicle & Engine Applications

Designed for ground crankshaft journals requiring a 0.001" 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 Uses: Muscle car restorations, drag racing, marine high-performance builds, and heavy-duty track applications

Key Specifications

• Part Number: 5M829H-001
• Crankshaft Undersize: 0.001 in / 0.025 mm
• Bearing Type: Main Bearing Set
• Material: Tri-metal Copper-Lead Alloy (Race Series)

Kit Contents

• 1x Complete Main Bearing Set (0.001" Undersize)

Building your Chevy V8 block? Drop our team a message if you need assistance confirming your journal clearances or matching parts for your build.