ACL Bearings 5M1038A-20 Main Bearing Set Small Block Chevy Undersize - 400 0.020

The ACL Bearings 5M1038A-20 is a complete main bearing set specifically engineered for Small Block Chevy 400 engines requiring 0.020 inch undersize bearings. This A-Series bearing set features ACL's proprietary Aluglide construction, designed for superior performance in OEM replacement and performance rebuild applications.

Construction and Materials:

• Proprietary composition of aluminum, tin, and silicon with steel backing
• Bi-metal construction for excellent strength and durability
• Electroplated overlay with copper for enhanced anti-seizure protection
• Standard bearing size: 2.6490 inches

Key Features:

• Outstanding wear resistance and load-carrying capabilities
• Exceptional anti-seizure, anti-wear, and anti-corrosion properties
• Superior embeddability for contamination tolerance
• Improved heat conduction and oil distribution
• Includes flanged thrust bearing and standard main bearings

Application:

• Small Block Chevy 400 V8 engines
• 0.020" undersize for machined crankshafts
• OEM replacement quality with performance advantages

ACL's Aluglide bearings are the same technology used by OEM manufacturers and have become a dominant choice among professional engine builders. The combination of aluminum, tin, and silicon creates an alloy with exceptional characteristics for both stock replacement and performance applications. Cross-reference part numbers include MS1038A-20 and MS1038P-20.