ACL Bearings 4B1201-.25 Performance Connecting Rod Bearing Set Undersize - 0.25mm

The ACL Bearings 4B1201-.25 is a high-performance tri-metal connecting rod bearing set designed to withstand higher RPM conditions. This Race Series bearing set is manufactured with a 0.25mm undersize specification for reground crankshafts, making it ideal for engine rebuilds and performance applications.

Key Features:

• High-strength overlay plate with reduced thickness for improved fatigue properties
• Hardened steel backs on all rod bearings to improve support of the bearing lining and assist with bearing retention in the housing
• Increased crush for improved bearing retention
• Elimination of flash plating on the back of bearings to improve heat transfer and maximize grip between bearings and housing
• Increased eccentricity to compensate for bore distortion at high RPM and assist in the formation of hydrodynamic oil films
• Tight consistent wall tolerances to help maintain consistent clearances
• Enlarged ID chamfers on bearing edges where required to accommodate large fillet radius on performance crankshafts

ACL bearings feature a tri-metal copper-lead heavy-duty material suitable for everyday and performance engines. ACL bearings are used for tuning and engine upgrades where you want better quality with higher bearing capacity than normal standard bearings.