The ACL 5M8309HC-STD is a Race Series main bearing set with a coated bearing surface, sized to standard specification for a stock, unmachined crankshaft main journal. It is built for Subaru EJ20/EJ22/EJ25 applications.
Specifications:
- Type: Main Bearing Set (Coated)
- Series: Race Series
- Size: Standard
- Engine Fitment: Subaru EJ20/EJ22/EJ25
- Part Number: 5M8309HC-STD
FAQ
What engine does the ACL 5M8309HC-STD fit?
The ACL 5M8309HC-STD is designed for Subaru EJ20/EJ22/EJ25 applications.
What does "Standard" size mean?
Standard size means the bearing is sized for a stock, unmachined crankshaft main journal, so no machining of the crankshaft is required.
Is this bearing set coated?
Yes. The ACL 5M8309HC-STD features a coated bearing surface, per ACL's part designation for this SKU.

