ACL Race Main Bearings Standard Size High Performance Position #5 (5M8309H-STD) | Subaru WRX 2002-2014 / STI 2004-2021

The ACL Race Main Bearings Standard Size High Performance Position #5 are engineered for Subaru WRX 2002–2014 and Subaru STI 2004–2021 EJ-series engines, delivering precise bearing geometry and increased load capacity for performance-driven engine builds. Designed specifically for crankshaft main position #5, these race bearings help maintain stable oil film control and dependable crankshaft support under high-RPM and high-load operating conditions.

KEY FEATURES

• High-performance race main bearing designed specifically for crankshaft position #5
• Standard size specification maintains factory oil clearance targets
• Precision-manufactured to ensure consistent bearing crush and alignment
• Enhanced load-handling capability compared to OEM bearing materials
• Ideal for performance street, track, and motorsports engine builds

TECHNICAL SPECIFICATIONS

• Bearing Type: Main bearing (position #5)
• Size: Standard
• Engine Platform: Subaru EJ-series
• Material: High-performance race bearing alloy
• Design Intent: Provides stable oil film control and reliable crankshaft support

VEHICLE FITMENT

• Subaru WRX 2002–2014
• Subaru STI 2004–2021

ACL manufactures precision-engineered engine bearings designed to deliver consistent oil clearance, improved load capacity, and reliable performance for street, performance, and motorsports engine builds.