ACL High Performance Main Bearing Set for Subaru EJ20/EJ22/EJ25 Engines - Thrust

Vehicle Fitment

• 1990-2000 Subaru Legacy (EJ22E, EJ22EZ, EJ25D, EJ251) - naturally aspirated & turbo variants
• 1995-2005 Subaru Impreza (EJ15, EJ16, EJ18, EJ20, EJ22, EJ25, including WRX 2002-05) - all trims
• 1995-2017 Subaru Forester (EJ20, EJ22, EJ25) - Base, L, S, X, XS models
• 1995-2004 Subaru Outback (EJ22E, EJ25D/EJ251) - all trims
• 2005 Saab 9-2X Aero (EJ205) - turbocharged configuration

Features

• ACL Race Series high-performance crankshaft main bearing set engineered for elevated RPM and load
• Tri-metal construction with hardened steel backing for superior strength and fatigue resistance
• Standard (STD) oil clearance suitable for stock crank journal dimensions
• 3/4-grooved main bearings optimize oil flow and hydrodynamic film formation
• Increased eccentricity aids oil film development under high RPM
• Enlarged ID chamfers to accommodate performance crank fillet radii
• Increased crush retention enhances bearing seating in the block
• Elimination of flash plating improves heat transfer and housing grip

Specifications

• Part Number: 5M8297H-STD
• Brand: ACL
• Series: Race Series Main Bearing Set
• Size: Standard (STD) journal diameter
• Oil Clearance: Standard
• Material: Tri-metal with hardened steel backing
• Position: Main crankshaft bearings for thrust in the #3 position
• Shaft Diameter (Std): 59.984 mm - 60.000 mm
• Housing Bore (Std): 64.000 mm - 64.020 mm
• Max Wall at Crown: 2.005 mm
• Max Overall Length: 19.00 mm

Included Components

• 5x Main bearing shells - standard size set

Product Description

The **ACL 5M8297H-STD Race Series Main Bearings** are precision-engineered performance components designed specifically for Subaru flat-four EJ-series engines - including EJ15, EJ16, EJ18, EJ20, EJ22, and EJ25 families used in Impreza, Legacy, Forester, Outback, and select Saab 9-2X Aero models from **1990 through 2017**. Built with a rugged tri-metal construction and hardened steel backing, these main bearings provide enhanced durability and resistance to fatigue under high-RPM and performance-oriented use.

Featuring 3/4-grooved designs and tight wall tolerances, the 5M8297H-STD set promotes optimal oil distribution and hydrodynamic lubrication to support crankshaft stability and longevity. The standard oil clearance suits stock journal dimensions, making this set ideal for engine rebuilds, high-output tuning, and performance builds while maintaining reliable clearances and consistent oil film behavior. ACL Race Series bearings are a trusted choice for motorsport and enthusiast builds where robust bottom-end support is critical.