ACL Bearings 4B1912HD-.025 High Performance Rod Bearings

ACL Race Series high-performance connecting rod bearings designed for demanding applications requiring oversized bearing clearances. The 4B1912HD-.025 features ACL's premium tri-metal construction with a steel backing, high-strength copper-lead intermediate layer, and a proprietary overlay for superior wear resistance and fatigue strength.

Key Features:

• -.025mm undersize for precision clearance adjustment and crankshaft machining
• Tri-metal racing construction for extreme durability under high load conditions
• Enhanced oil retention grooves for improved lubrication flow
• Precision manufactured to strict tolerances for proper oil clearance
• Ideal for high-performance street, racing, and boosted applications
• Compatible with both stock and performance crankshafts

ACL Race Series bearings are engineered to withstand the rigors of high RPM operation, increased cylinder pressures, and extreme temperatures. The HD (Heavy Duty) designation indicates enhanced material specifications for demanding performance environments. These bearings provide the reliability needed for modified engines while maintaining proper oil film thickness under severe operating conditions.