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Old 09-17-2006, 10:48 PM   #1
saab-on-the-cobb
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Default V2 RA STi block vs. 2.5 USDM STi block with '05 wrx heads?

As the title says: I plan on swapping blocks in my 05 wagon. Is the V2 JDM STI block better for high RPM apps than the 2.5 USDM?

Will this block bolt-on to the USDM WRX heads?

I will add cams/valves, etc eventually, but want to run a high RPM Type RA STi block.

Is this doable????

Thanks!

SOTC
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Old 09-18-2006, 01:06 PM   #2
FuJi K
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The bore/stroke is better suited for higher revvs than the 2.5L. You'll need a built 2.5L to run efficient in the higher revvs(lighter pistons).

There shouldn't be a problem bolting it up together. We have guys putting in EJ257 with 2.5L NA DOHC/SOHC heads. I put my '99 2.2L heads on my EJ22T shortblock.
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Old 09-18-2006, 01:14 PM   #3
saab-on-the-cobb
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Originally Posted by FuJi K View Post
The bore/stroke is better suited for higher revvs than the 2.5L. You'll need a built 2.5L to run efficient in the higher revvs(lighter pistons).

There shouldn't be a problem bolting it up together. We have guys putting in EJ257 with 2.5L NA DOHC/SOHC heads. I put my '99 2.2L heads on my EJ22T shortblock.

Thanks!

Will the V2 cams/valves fit my heads?

SOTC
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Old 09-18-2006, 01:21 PM   #4
FuJi K
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If those are the STi Ver 2 stuff...from the 1st generation Impreza, those cams will not fit your heads due to different castings. You would need cams made for the NEWER style heads; possibly STi Ver 7 and up. The STi version 1-4 are same but version 5/6+ possibly share the same head casting for the cams, not too sure.
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Old 09-18-2006, 04:24 PM   #5
Jaxx
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no... nono

ver 2 are only good for ver 2 ..v.1....3/4 and 5/6... v.7(2.0)-v.9 all differnt

the usdm block has FAR FAR more power potential .. yes the v.2 will spin faster .. but that won't make up for the displacemnt

ex
v.2 make 300 hp at 8000 rpm
usdm make 350hp at 7000 rpm
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Old 09-18-2006, 06:13 PM   #6
saab-on-the-cobb
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Quote:
Originally Posted by Jaxx View Post
no... nono

ver 2 are only good for ver 2 ..v.1....3/4 and 5/6... v.7(2.0)-v.9 all differnt

the usdm block has FAR FAR more power potential .. yes the v.2 will spin faster .. but that won't make up for the displacemnt

ex
v.2 make 300 hp at 8000 rpm
usdm make 350hp at 7000 rpm

WOW! Member # 177!

Tanks fer the heads-up!

SOTC
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Old 09-18-2006, 07:03 PM   #7
Matt Monson
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Jaxx,
You're old skool...
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