ACL Race Series 5M8309HO/S5-STD is a standard-clearance main bearing set for Subaru EJ20, EJ22, and EJ25 Phase 2 engines with the thrust bearing in position five and a 0.005-inch oversized housing requirement. Match the exact part number, engine version, thrust position, housing bore, crankshaft dimensions, and measured oil clearance before ordering.
Key Features
Fitment
| Years | Make | Model | Application |
|---|---|---|---|
| 2005 | Saab | 9-2X | Confirm compatible Subaru EJ engine and measured clearances |
| 1998 | Subaru | Forester | Confirm Phase 2 EJ engine and thrust in position five |
| 2000-2004 | Subaru | Forester | Confirm Phase 2 EJ engine and thrust in position five |
| 1995-1998 | Subaru | Impreza | Confirm compatible EJ engine and measured clearances |
| 2000-2005 | Subaru | Impreza | Confirm compatible EJ engine and measured clearances |
| 1991-1994 | Subaru | Legacy | Confirm compatible EJ engine and measured clearances |
| 1996-2000 | Subaru | Legacy | Confirm compatible EJ engine and measured clearances |
| 2000 | Subaru | Outback | Confirm compatible EJ engine and measured clearances |
Specifications
| Brand | ACL |
|---|---|
| Manufacturer Part Number | 5M8309HO/S5-STD |
| Component | Crankshaft main bearing set |
| Series | Race Series |
| Housing Size | 0.005 inch oversized |
| Oil Clearance | Standard |
| Thrust Position | Position five |
| GTIN | 9315726454220 |
What's Included
One ACL 5M8309HO/S5-STD main bearing set in the manufacturer package. Related rod bearings, seals, fasteners, lubricants, measurement tools, and machine work are not included unless expressly stated.
About ACL
ACL manufactures engine bearings for replacement, performance, and motorsport engine builds. Bearing selection requires exact part-number matching and measured assembly clearances rather than vehicle fitment alone.
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Frequently Asked Questions
What does 0.005-inch oversized mean on ACL 5M8309HO/S5-STD?
It identifies the required oversized housing bore. It does not replace machine-shop measurement of the block, crankshaft journals, bearing thickness, and assembled oil clearance.
Does Subaru vehicle fitment alone confirm this bearing set?
No. Confirm the exact EJ engine version, Phase 2 configuration, thrust bearing in position five, housing bore, crankshaft dimensions, and required oil clearance.
Can this bearing set be installed without engine-builder measurements?
No. Every journal, housing bore, bearing position, and assembled oil clearance must be checked with calibrated tools before final assembly.
Installation
Have a qualified engine builder inspect and measure the block and crankshaft. Clean every oil passage and bearing seat, verify thrust position and oil-hole alignment, measure assembled oil clearance, follow Subaru and ACL lubrication and torque procedures, confirm free rotation, and prime the lubrication system before startup.
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