ACL Bearings 5M429A-30 Main Bearing Set Small Block Chevy Undersize - 030

The ACL Bearings 5M429A-30 is a complete main bearing set designed specifically for small journal Chevrolet small block engines, including 265, 283, 302, and 327 cubic inch applications. This set features a .030 inch undersize specification for use with reground crankshafts.

Aluglide Bimetal Construction:

These main bearings utilize ACL's proven Aluglide technology, featuring a proprietary bimetal composition of aluminum, tin, and silicon bonded to a steel backing. This advanced metallurgy was developed specifically for OEM replacement applications and delivers the ideal balance of performance characteristics for reliable engine operation.

Key Features:

• Application-specific design for small journal SBC engines (265, 283, 302, 327 CI)
• .030" undersize for reground crankshafts
• Aluminum-tin-silicon alloy provides exceptional wear resistance
• Steel backing ensures strength and dimensional stability
• Excellent anti-seizure and anti-wear characteristics
• Superior embeddability to protect against contaminants
• Outstanding corrosion resistance for extended service life
• Exceptional load-carrying capacity

ACL's Aluglide bearing technology has become an industry-leading standard for engine bearing materials, offering the perfect combination of durability, reliability, and performance for both stock rebuilds and performance applications. The aluminum-based alloy construction meets modern environmental standards while providing superior protection for your engine's crankshaft.