ACL 7M1397HX-STD Race Series Main Bearing Set for BMW N54/N55/S55 3.0L Engines

Vehicle Fitment

• 2007-2016 BMW 135i, 335i, 435i (N54, N55)
• 2012-2019 BMW 640i, 740i, 740Li (N55)
• 2012-2019 BMW X5 xDrive35i, X6 xDrive35i (N55)
• 2015-2019 BMW M2, M3, M4 (S55)

Features

• Trimetal construction with steel back, copper-lead, and overlay
• Enhanced bearing eccentricity for improved oil retention
• Increased crush for better bearing retention
• Extended grooves to optimize oil flow
• Enlarged I.D. chamfers for improved fitment
• Extra oil clearance of 0.001" for high-performance applications
• Designed for both naturally aspirated and turbocharged engines
• Suitable for street and motorsport applications

Specifications

• Width: 0.949 in.
• Outside Diameter: 2.558 in.
• Shaft Diameter: 2.1636 in.
• Material: Trimetal (Steel back, copper-lead, overlay)
• Compatibility: Standard size for OEM crankshafts
• Oil Clearance: +0.001" extra clearance

Included Components

• 1x ACL 7M1397HX-STD Main Bearing Set

Product Description

The ACL 7M1397HX-STD Main Bearing Set is engineered to provide superior performance and reliability for BMW's N54, N55, and S55 3.0L engines. Whether you're building a high-performance street engine or restoring your daily driver, these bearings offer the durability needed to withstand the rigors of high RPM operation.

Constructed with a trimetal design, the ACL bearings feature a high-strength overlay plate that reduces thickness for improved fatigue resistance. The hardened steel backs enhance bearing retention, while increased crush improves overall stability. These bearings are designed to fit standard OEM crankshafts, ensuring a hassle-free installation.

Ideal for both naturally aspirated and turbocharged applications, the ACL 7M1397HX-STD bearings are a trusted choice for enthusiasts seeking performance and longevity.