ACL Bearings 5M1557P-30 Performance Main Bearing Set Undersize - 0.030

The ACL Bearings 5M1557P-30 is a high-performance main bearing set designed for precision engine builds requiring 0.030" undersize crankshaft journals. This complete main bearing set features ACL's advanced Race Series engineering for engines that demand superior durability and reliability under high-stress conditions.

Key Features:

• High-strength overlay plate with reduced thickness for improved fatigue resistance
• Hardened steel backing for enhanced bearing support and retention in the housing
• Increased crush design for improved bearing retention and heat transfer
• Optimized bearing wall tolerances for consistent oil clearances
• Elimination of flash plating on bearing backs for maximum heat dissipation
• 3/4 grooving design provides optimal oil supply to main bearings
• Tri-metal construction engineered for high-RPM performance applications

ACL Race Series main bearings are manufactured to exacting tolerances with particular attention to wall thickness accuracy, ensuring reliable fit and consistent clearances. The unique combination of design, metallurgy, and engineering provides the endurance and capability to perform in demanding street and motorsport applications where standard bearings cannot.