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Old 03-05-2008, 02:24 PM   #1
NicktheBrit
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Member#: 31707
Join Date: Jan 2003
Location: Los Angeles,CA
Vehicle:
1995 Open Class
GC rally car

Default USDM 2.0 heads on a USDM STi Block?

I'm sure this has been asked and discussed on here a million times but I can't find anything definitive.

I have a WRX motor with a melted piston but good heads.
I can get an STi shortblock for a decent price and maybe slap on these heads.

Can this be done?
Is it worth it?
Am I being really stupid? IByesyouare.

It is going into a GC rallycar, but I'm not ready to shell out a truckload of cash for a super built motor yet.

Thanks.
Nick.
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Old 03-05-2008, 02:30 PM   #2
Turbo_Mike
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Location: Dudley, MA
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2004 Pontiac GTO
LS1 T56 RWD

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Old 03-05-2008, 02:42 PM   #3
NicktheBrit
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GC rally car

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Perfect.
This line...

"Honestly for how much it costs to buy a STi shortblock, 2.0 heads just kill it. Its still a reasonable upgrade from the 2.0, but eh I dunno, I still dont know if a "budget hybrid" is worth it if you dont go all the way with heads too...."

says it all for me.
I'm just thinking too hard todat.

Thanks Mike!
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Old 03-06-2008, 07:49 AM   #4
sammyswrxsti
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Join Date: May 2007
Location: Yadkinville, NC
Vehicle:
2002 WRX
Midnight Black Pearl

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im looking at doing the same thing... but i am going to spend 1500 on my heads first...


cams, valves, springs &retainers, and then a built block on a stock 5 speed isnt good... disaster waiting to happen... upgrade the tranny too.. thats what im doing
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Old 03-06-2008, 03:10 PM   #5
Tenacious Bee
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Location: Pennsylvania
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So, what to play
with next ?

Default

Well I will say this. My hybrid with stock wrx heads is more fun to drive than the 2.0L ever was. There are a lot of folks running these. I felt that both motors ran out of steam past 6300 rpm. The 2.5L is just stronger up to that point.

I am not advocating that all hybrid owners over look getting their heads done. My point is that replacing a broken 2.0L with another one is not the best course of action to me. While the heads hold the full potential back you still end up with more. I only plan to run the car this way until fall. I will then pull the heads and pistons and replace them with better components.
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Old 03-06-2008, 04:11 PM   #6
dmross
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2000 2.5RS

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Quote:
Originally Posted by Tenacious Bee View Post
While the heads hold the full potential back you still end up with more. I only plan to run the car this way until fall. I will then pull the heads and pistons and replace them with better components.
I would say that it's mainly the cams that are holding you back. If you can get the CR reasonable and put in a more suitable cam, the 2.0 WRX heads won't drop off as much in the top end, and then you can modify them further (porting, etc.)
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