ACL Bearings 4M2037A-.50 Connecting Rod Bearing Set Undersize - 0.50mm

The ACL Bearings 4M2037A-.50 is a high-performance connecting rod bearing set designed for precision engine builds and crankshaft regrinding applications. This undersize bearing set features a 0.50mm reduction in diameter, making it ideal for crankshafts that have been machined to remove surface imperfections or restore proper oil clearances.

Key Features:

• 0.50mm undersize for use with reground crankshafts
• High-strength trimetal construction for superior durability
• Hardened steel backing on all rod bearings for improved support and retention
• Reduced thickness overlay plate for enhanced fatigue resistance
• Elimination of flash plating on bearing backs for improved heat transfer
• Increased eccentricity to compensate for bore distortion at high RPM
• Enlarged chamfers to accommodate performance crankshafts with large fillet radii
• Tight wall tolerances for precision fitment

ACL Race Series bearings are engineered to withstand higher RPM conditions and extreme loads, making them the preferred choice for performance rebuilds, racing applications, and high-output street engines. The unique combination of metallurgy, design, and manufacturing precision delivers the endurance and reliability demanded by professional engine builders and motorsports competitors worldwide.