ACL Bearings 5M429A-20 Small Block Chevy Main Bearing Set .020 Undersize

The ACL 5M429A-20 is an Aluglide Series main bearing set designed for Small Block Chevrolet small journal engines, including 265, 283, 302, and 327 cubic inch displacements. This bearing set is manufactured .020 inch undersize for use with reground crankshafts.

Aluglide Bearing Technology:

Aluglide rod and main bearings were developed for OEM engines and feature a proprietary composition comprised of aluminum, tin and silicon. This metallurgy mix, combined with a steel backing, provides excellent characteristics such as strength, anti-seizure, anti-wear, embeddability and anti-corrosion. The design delivers exceptional wear resistance, outstanding strength, and excellent load-carrying characteristics.

Key Features:

• Bi-metal construction with aluminum-tin-silicon alloy bonded to steel backing
• Lead-free, environmentally friendly composition
• Superior anti-seizure and anti-wear properties
• Excellent embeddability for debris protection
• Ideal for stock replacement and general performance applications
• .020" undersize for reground crankshafts

In a relatively short time since its introduction, Aluglide engine bearings have become a dominant factor in engine bearing materials, with the combination of aluminum, tin and silicon creating an alloy with exceptional wear resistance, outstanding strength and excellent load-carrying characteristics.