Subaru Genuine Hardened Crankshaft Part Number - 12200AA390

For all rear thrust EJ20 engines 1998-onwards.

A genuine Subaru heat treated (induction hardened) EJ20 75mm Stroke crankshaft and ACL Race Series Engine Bearing Set.

Please note that this crank and bearing set is for the rear thrust crankcase type.
Uses the 60mm main bearing and the 52mm Big End Bearing Journals.
It also has a 75mm stroke.

ACL Race Series Engine Bearings are one of the largest ranges of automotive engine bearings in the world. ACL Bearing Company are known worldwide and are a highly popular choice when building and maintaining engines.


Tuning Developments can supply all ACL Race Series Engine Bearings in the UK, ACL Race Series Big End Bearings, ACL Race Series Main Bearings and ACL Race Series Thrust Washer Kits.




Tuning Developments keep a large amount of ACL Race Series Engine Bearings in stock in the UK, all stock is available for next day delivery keeping turnaround times as quick as possible. If you cannot see the ACL Race Series Engine Bearings that you require, then please get in touch with Tuning Developments either via email or telephone via our contact us section and we will be glad to assist.

ACL traces its past to 1922 and the trade mark of “ACL” were used from 1951. Making ACL Engine Bearings your number one choice and recommended by Tuning Developments.


To visit the ACL Website, please click here to be redirected.

To visit the ACL Race Series Website, please click here to be redirected.


Item: Subaru Hardened Crankshaft 75mm Stroke with ACL Race Series Main and Big End Bearings
Application: Subaru Impreza WRX STI EJ20 Engines with Thrust in position 5 (Rear) and 52mm Big End Journals with 75mm Stroke
Part Number:
Subaru 12200AA390
ACL 5M8309H - STD
ACL 4B8296H - STD

This "JDM" crankshaft is still considered to be the best "standard" option available for all EJ20 engines and is the preferred choice before investing in more expensive billet crankshafts.