In the quest to find out a key for determining where the EJ22 interference engine can be externally identified, I found the following numbers on the vehicle plate mounted on the drivers side of the engine compartment over the wheel well (thanks rallykeith):

 

Engine numbers:

 

EJ22EAW1BC '91 Legacy

EJ22ECM5GB '96 Impreza

EJ22ECW6FZ '97 Impreza

 

 

Transmission numbers:

 

TY752VA1AA '91 Legacy wagon

TY752VABBA '96 Impreza wagon

TY752VA5AA '97 Impreza wagon

 

I know some of the info here is manufacture year and which plant actually built that part but there should be more info encoded in the numbers but I haven't found any reference to this in any of the FSMs I have. Anyone have any more numbers or information on this?

FWIW, When I was dealing with the automatic transmission on my 96 Legacy I needed to figure out what the last two letters of the trans code meant. I just asked the parts guy at my local subaru dealership, who has worke there for probably 20 years, and he told me the last two meant nothing. I asked on the board here and got nothing. The thread is HERE

 

Keith