ACL Subaru WRX & STi EJ20 & EJ25 Tri-Metal Main Bearings

Available for these Applications:
2002-2014 Subaru WRX.
2004-2015 Subaru STi.

Please note:
Subaru main bearings are specific to either a #5 or #3 journal bearing position.
Please confirm your application prior to purchasing.

Part Numbers:
(5M8297H) For #3 Journal Style
(5M8309H) For #5 Journal Style

(#-STD) Standard
(#X-STD) Standard with Extra Oil Clearance
(#-.025) .025mm Oversized
(#-.25) .25mm Oversized
(#-.50) .50mm Oversized



ACL's Tri-Metal main bearings are made of a softer metal so that you don't wear out your crank or engine block. Additionally, a thin layer of oil lubricates the connection between the bearings and the crank allowing the crank to "float" and reduce wear. Proper support via main bearings is crucial to prevent oscillations and wear that can damage the crankshaft and other components as the motor moves further out of balance.

(4G63 Bearings are pictured.)