ACL Main Bearings Standard Size Position #5 (5M8309A-STD) | Subaru WRX 2002-2014 / STI 2004-2021

The ACL Main Bearings Standard Size Position #5 are engineered for Subaru WRX 2002–2014 and Subaru STI 2004–2021 EJ-series engines, providing precise crankshaft support and reliable oil film stability in OEM and performance-oriented engine builds. Designed specifically for crankshaft main position #5, these bearings deliver consistent clearance control and dependable durability for street and mild performance applications.

KEY FEATURES

• OEM-style main bearing designed specifically for crankshaft position #5
• Standard size specification maintains factory oil clearance targets
• Precision-manufactured for consistent bearing crush and alignment
• Designed to support stable oil film control under normal and performance driving conditions
• Ideal for stock rebuilds and performance-refresh EJ engine builds

TECHNICAL SPECIFICATIONS

• Bearing Type: Main bearing (position #5)
• Size: Standard
• Engine Platform: Subaru EJ-series
• Material: OEM-equivalent performance bearing alloy
• Design Intent: Provides reliable crankshaft support and consistent oil clearance

VEHICLE FITMENT

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

ACL manufactures precision-engineered engine bearings designed to deliver consistent oil clearance, dependable durability, and reliable performance for street and performance engine builds.