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Old 11-26-2011, 06:09 AM   #1
Scooby Newbie
Member#: 115324
Join Date: May 2006
Chapter/Region: SCIC
Location: El Centro
2002 WRX wagon

Default 07 wrx engine block in an 04 wrx wagon?

Long story short... I fried my engine last night from my 04 wrx overheating. I need to replace the engine block. I am looking into maybe getting an 06-07 wrx block to get the 2.5L. Is it gonna work? Do I need to mod anything for fitment or swap anything? Highly appreciate any experience or input!!!
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Old 12-08-2011, 11:32 PM   #2
Scooby Specialist
Member#: 97904
Join Date: Oct 2005
Chapter/Region: Tri-State
2002 WRX
World Rally Blue


I was originally going to do the hybrid 2.5 block with the 2.0 heads when my motor spun a rod bearing 2 years ago. You will hear things like the hybrid setup causes lots of problems and you will hear how others have done it and love it. All I can say is there are some differences and you will need to do a lot of research and also shell out quite a bit of $$$ to do a build. While there are a lot of people here who know their stuff there are a lot that just put out what they think sounds good but have nothing to back it up so good luck with whatever venture you decided to take. Me personally, I ended up with a built 2.5 block and 100mm pistons. Then I realized something with my heads made them unusable so with the need for heads I ended up with 07 STI heads. There are a lot of differences that I wasn't aware of and learned as went. I just finally (2years later) got the motor in the car last weekend but ended up with a pressure problem ( a port in the center of the 2.5l that's not on the 2.0 and routing to the heads in the wrong configuration caused my rear main seal to leak after running it at idle 20 mins after the first startup (90 secs then changed oil to make sure all metal shaving from the machine work were out). There are a lot of helpful threads on here written by people who have done it and will be a much needed tool. So I am changed the rear main seal tomorrow after dropping the trans out and I now have the correct configuration for attaching the lines from that center pressure port on the 2.5l to the correct ports on the 07 STI valve covers. So I hope everything turns out ok ( fingers crossed ).

Honestly for the amount I put into this swap, and I get parts wholesale bcuz I also sell them, I realized that if my 2.0L heads were usable I would have just got a new Subaru 2.0L block and saved myself the time and extra money. But once you get so far into it with buying stuff there simply is no turning back.

If you're on a budget, I'd suggest a decent low mileage used block, a new gasket kit, oil pump, oil cooler etc and be on your way. .

p.s. don't forget that when you take your heads off they will need to be decked to make sure they are true and there is a certain procedure for re-bolting them back on a new block.

Like I said earlier....lots of stuff you will learn along the way. Or you could find a used long block to just drop in. Not sure if this helps you out at all just some of the things i experienced.

But if you have the means it is satisfying to build something yourself

Good luck.

Last edited by cuztomimportz; 12-08-2011 at 11:49 PM.
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