This ACL High Performance main bearing set is sized for a standard, unmachined crankshaft main journal on the Subaru EJ20/EJ22/EJ25 engine family, with the thrust surface located at the #3 main bearing position. Per ACL's own fitment data it's used in the Subaru Impreza (including WRX), Legacy, Outback, and Forester, as well as the Saab 9-2X. Main bearings support the crankshaft in the engine block and are matched with rod bearings to control bottom-end clearances; the thrust position controls crankshaft end-play.
Specifications:
- Type: Main Bearing Set
- Series: High Performance
- Size: Standard (fits stock, non-machined main journal)
- Thrust Position: #3
- Engine Fitment: Subaru EJ20/EJ22/EJ25
- Part Number: 5M8297H-STD
FAQ
What does "For Thrust in #3 Position" mean?
Subaru EJ-series blocks were built with the thrust bearing surface at different main positions depending on the engine/model year. This set has the thrust flange at the #3 main position — confirm which position your block uses before ordering, since a #5-position bearing won't control end-play correctly in a #3-position block.
What does "Standard Size" mean?
Standard size means it's sized for a stock, non-machined main journal. Use standard size unless the crankshaft has been machined or reground oversize.
What vehicles does this main bearing set fit?
It's sized for the Subaru EJ20/EJ22/EJ25 engine family, used in the Impreza (including WRX), Legacy, Outback, and Forester, as well as the Saab 9-2X.
Do I need rod bearings too?
Yes, this listing is for main bearings only. Rod bearings for the EJ20/EJ22/EJ25 are sold separately.
