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.
Why Choose ACL Race Series Main Bearings?
Built for the rigorous demands of high-performance street and motorsport applications, ACL Race bearings utilize advanced metallurgy and engineering:
- Tri-Metal Construction: High-strength copper-lead alloy structure blended for maximum load capacity and seizure resistance.
- Hardened Steel Backs: Provides robust support for the bearing lining and maintains tight housing retention under extreme cylinder pressures.
- Eliminated Flash Plating: Unplated bearing backs improve heat transfer directly into the housing and maximize grip.
- Increased Crush & Eccentricity: Designed to compensate for bore distortion at high RPM and assist in maintaining consistent hydrodynamic oil films.
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.