ACL Bearings 7M1397H-STD Race Series Standard Main Bearing BMW - Set for N54 N55 S55 3.0L

The ACL Bearings 7M1397H-STD is a Race Series standard size main bearing set specifically engineered for BMW N54, N55, and S55 3.0L inline-six engines. ACL Race Series bearings are designed for high-performance and racing applications where increased loads and higher RPM operation demand superior bearing protection.

Key Features:

• Race Series construction for high-performance and motorsports applications
• Standard (STD) bore size for stock or standard rebuild specifications
• Tri-metal construction with high-strength steel backing for maximum durability
• Proprietary overlay material provides excellent embedability and conformability
• Enhanced oil clearances optimized for performance engine builds
• Compatible with BMW N54, N55, and S55 turbocharged 3.0L engines
• Manufactured to strict tolerances for precise fitment and reliable operation

ACL Race Series bearings feature advanced metallurgy and coating technology to withstand the extreme conditions of high-output turbocharged engines. The tri-metal design combines a high-strength steel backing layer, a copper-lead intermediate layer, and a specialized overlay material that provides excellent protection against wear, scoring, and fatigue. These bearings are ideal for street/strip builds, road racing, time attack, and other demanding applications where standard OEM bearings may not provide adequate protection.

This complete main bearing set includes all bearings required for a complete crankshaft installation. Proper installation requires careful measurement of bearing clearances and adherence to BMW specifications and ACL's installation guidelines.