ACL Race Main Bearings Standard Size Position #5 Extra Oil Clearance (5M8309HX-STD) | Subaru WRX 2002-2014 / STI 2004-2021

The ACL Race Main Bearings Standard Size Position #5 with Extra Oil Clearance are engineered for Subaru WRX 2002–2014 and Subaru STI 2004–2021 EJ-series engines that demand enhanced lubrication control in high-performance and motorsports applications. Designed specifically for crankshaft main position #5, these HX-series bearings provide increased oil clearance to support higher RPM operation, elevated bearing loads, and improved oil film stability under extreme conditions.

KEY FEATURES

• Race-series main bearing designed specifically for crankshaft position #5
• HX specification provides extra oil clearance for performance engine builds
• Improves oil film thickness under high RPM and increased load conditions
• Precision-manufactured for consistent bearing crush and accurate alignment
• Ideal for track-driven, turbocharged, and aggressively tuned EJ engines

TECHNICAL SPECIFICATIONS

• Bearing Type: Race main bearing (position #5)
• Size: Standard with extra oil clearance (HX)
• Engine Platform: Subaru EJ-series
• Material: High-performance tri-metal bearing alloy
• Design Intent: Increased oil clearance for improved lubrication stability and load capacity

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.