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Old 03-13-2009, 02:50 PM   #1
mystilexzero
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Join Date: Jul 2007
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Location: Nor cal
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2007 wrx
ugm

Default ej257 into my07 wrx questions

Hey i was wondering, if i rebuild an 04 sti motor will i have any problems fitting this into my07 wrx? will any feed lines be different/ water lines/ will the head bolt up? i did a search but no one really states the problems.

And also the block im buying has no crank, would there be any problem buying another used crank off another member and giving it to a machine shop to make them match up?
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Old 03-13-2009, 07:18 PM   #2
Fongers
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Get a new crank and bearings instead of cutting it and going oversize (less chance of failure). everything else should be ok as long as you get the right 2.5 HG with the proper water holes for the block.
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Old 03-16-2009, 12:57 AM   #3
mystilexzero
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got it thanks! i was also wondering, since im putting my car back to stock to break in the motor, will i need a tune to run this built bottom end block?
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Old 03-16-2009, 02:17 AM   #4
Fongers
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VE will change, get a good base tuneand IMHO), no boost but rev high after 400 for first 1K
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Old 03-19-2009, 12:34 PM   #5
mystilexzero
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will i need an sti oil pan or will my 2.5l wrx oil pan fit?
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Old 03-23-2009, 08:02 PM   #6
mystilexzero
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also im trying to search but i cant figure out what the differences are in the gasket kits, if i have an 07 wrx and im using an 04 sti shortblock, would the 06-07 wrx master seal kit work or would i have to purchase individual gaskets and seals from subaru since the motors are of different years and makes
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Old 03-23-2009, 08:59 PM   #7
Fongers
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Since my 2.0 WRX pan fit, I don't see why the 2.5 wouldn't but don't quote me on it. The important thing is to use the matching oil pickup for whichever pan you decide on since mixing those will likely cause you starvation.

As for the seals kits, I used a wrx master seal kit since I was harvesting most of the parts from the old rex as possible to build the hybrid and the only thing I think I needed to get that was EJ25 specific was Headgaskets (which I had to anyhow since I was lowering compression).
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Old 03-24-2009, 02:21 AM   #8
mystilexzero
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cool right on, so i think an 06 07 wrx seal kit should work then
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