Water pump question for my 2.5L swap

[02 WRX Chris]

Was at work today looking up water pumps for WRX's cause im going to change it when I have the motor out, and noticed that 02-04 (2.0L) is one pump, and 05 (2.5L) and up is another.  I got them both in my hands and could not find 1 difference in the pump!  Same mounting, same hose sizes, everything looked the same except for the price lol.  Anyone tell me what the difference could be??

 

[apkarian100]

The USDM 2.5L Turbos (EJ255 & EJ257) use the same water pump as the EJ207 engines, equivelant to the JDM Spec C water pump.

Having said that, I believe there is no difference. If you look many places, the EJ255/EJ257/EJ207/EJ205 pumps are all interchangable.

When I got a EJ207 SB and accessories for my 02 WRX a couple years ago, the old EJ205 pump and the EJ207 pump looked to the exact same. Knowing the EJ207 pump is the same as the EJ255/EJ257 pump, and knowing the EJ205 pump has the same look and fit, it doesn't seem worth it to spend the extra $40.

 

[02 WRX Chris]

Okay, that's what I thought.  Its weird cause at work, they have different part numbers and they are like 40 buck different in price too.

 

[drvsdwz]

He has an ej205, not an ej207, so the above is invalid unless you have other information.

 

[Matt]

The 255 and 257 is the same block. Only the internals are different. He has a 2.0l now.

 

[02 WRX Chris]

Well I read his post to quick, thought it said EJ205 ><.  So I guess my question is unanswered still.

 

[apkarian100]

He has an ej205, not an ej207, so the above is invalid unless you have other information.

I added some more info. I apologize for the confusion.

 

[02 WRX Chris]

Okay that makes sense now.  I just didn't know if one moved more volume or something.  Thanks