MAIN BEARING SET SUBARU EJ20,25 1998-ON (ACL RACE SERIES) 5M8309HX-STD


MAIN BEARING SET SUBARU EJ20,25 1998-ON (ACL RACE SERIES) 5M8309HX-STD - NZ Air Filter

In stock

Price:  NZD $269.95 NZD $219.73 (inclds GST)

Quantity in stock 1 item(s) available.

Generally Overnight Delivery with Courier Post




Recent View

ACL Race Series Extra Clearance Main Bearing Set (STD +0.025mm), Subaru EJ20 / EJ25 — 5M8309HX-STD

Enhanced oil clearance and supreme load capacity for high-boost Subaru boxer builds. When pushing your Subaru EJ-series engine with higher turbo boost, increased RPM, or heavy track use, standard bearing clearances can sometimes restrict vital oil flow. The ACL Race Series HX-Type Main Bearing Set (5M8309HX-STD) features an additional 0.025mm (0.001") of oil clearance on standard journal sizes, ensuring robust hydrodynamic lubrication under extreme motorsport conditions.

Why Choose ACL "HX" Extra Clearance Bearings?

Built specifically for high-performance modified and racing Subaru engines, the HX range delivers critical advantages:

  • Extra Oil Clearance (+0.025mm / 0.001"): Increases bearing oil flow to help prevent metal-to-metal contact under high loads, heavy heat, and high RPM.
  • High-Strength Overlay Plate: Reduced overlay thickness paired with enhanced fatigue resistance.
  • Hardened Steel Backs: Provides maximum support for the bearing lining and maintains tight housing retention.
  • Eliminated Flash Plating: Unplated bearing backs improve thermal heat transfer directly into the engine block.

Vehicle & Engine Applications

Designed for standard journals requiring extra oil clearance on Subaru flat-4 engines:

  • Subaru EJ20 / EJ20G / EJ205 / EJ207 (2.0L Turbo & Non-Turbo)
  • Subaru EJ25 / EJ255 / EJ257 (2.5L Turbo & Non-Turbo)
  • Common Fitments: Subaru Impreza WRX / STI, Forester GT / XT, Liberty / Legacy B4, and GC8 / GDA / GDB / GRB platforms.

Key Specifications

  • Part Number: 5M8309HX-STD
  • Size / Clearance: Standard (STD) with +0.025mm (0.001") extra oil clearance
  • Bearing Type: Main Bearing Set (HX Extra Clearance Series)
  • Material: High-performance Tri-metal construction

Kit Contents

  • 1x Complete Main Bearing Set (Standard Size with Extra Oil Clearance)

Rebuilding your Subaru boxer engine? Drop our team a message if you need help verifying clearances or finding matching rod bearings for your build.