ACL Bearings 8B634AO/S2-30 Connecting Rod Bearing Set Undersize - 0.030

The ACL Bearings 8B634AO/S2-30 is a high-performance connecting rod bearing set designed for demanding engine builds. This Race Series bearing set features ACL's advanced tri-metal construction with precision engineering to deliver exceptional durability under extreme operating conditions.

Key Features:

• Tri-metal Race Series construction for superior strength and durability
• 0.030" undersize for reground crankshafts
• S2 clearance specification: bearings are 0.0005" thinner per half to provide 0.001" extra clearance for standard-sized crankshafts
• Hardened steel backing on all rod bearings for improved support and bearing retention
• Elimination of flash plating on bearing backs for improved heat transfer and maximum grip in housing
• Increased eccentricity to compensate for bore distortion at high RPM
• Enlarged ID chamfers on bearing edges to accommodate large fillet radius on performance crankshafts
• Tight, consistent wall tolerances for maintaining proper clearances

ACL Race Series bearings are engineered specifically for high-performance and racing applications where standard bearings cannot withstand the increased loads, temperatures, and speeds. The unique combination of advanced metallurgy and precision manufacturing provides the endurance needed for demanding performance builds.