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Old 03-29-2006, 03:42 AM   #1
mistaboosta
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Default 2.5L crawford shortblock on 2.0L 2004 WRX heads

Hi,

I thought about this combo but the bore of the shortblock is much bigger than the bore of the heads. So wouldn't that damage the heads after some time? Everytime some of the explosion in the cylinder will end up on the surface of the heads.
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Old 03-29-2006, 02:55 PM   #2
kcscoob
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I think it is the stroke that is the difference on the 2.5 litre. Anyone?
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Old 03-29-2006, 03:10 PM   #3
02Toyowrx
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A larger bore will not be a problem. Now if you used 2.5L heads on a 2.0L engine(smaller bore engine) this would not be so good.
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Old 03-29-2006, 06:26 PM   #4
mistaboosta
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my mechanic insists on it would hurt the heads. how can i persuade him about it wont hurt?
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Old 03-29-2006, 10:20 PM   #5
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Quote:
Originally Posted by mistaboosta
my mechanic insists on it would hurt the heads. how can i persuade him about it wont hurt?
You could have him give me a call, maybe I can help with his concerns.

760-631-2927

Quirt Crawford
www.crawfordperformance.com
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Old 03-30-2006, 12:09 AM   #6
JonofScio
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listen to quirt... he is the man...
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Old 03-31-2006, 07:11 AM   #7
mistaboosta
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i wish i could.. I'm from europe and my mech. cant speak english

could u explain me shortly so i can tell that to him?
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Old 03-31-2006, 12:39 PM   #8
keaniegenie
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Quote:
Originally Posted by mistaboosta
Hi,

I thought about this combo but the bore of the shortblock is much bigger than the bore of the heads. So wouldn't that damage the heads after some time? Everytime some of the explosion in the cylinder will end up on the surface of the heads.

If your budget allows for a built shortblock, why not just get 2.5l sti heads too? Your mechanic obviously won't have a problem, the cams and heads flow better, and you add avcs. If you don't get an STI ecu, get a Hydra for your ems. The hydra will control avcs on a WRX ecu.
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Old 03-31-2006, 03:27 PM   #9
ImprezaRSX
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IF you are going to a 2.5L block, you should take advantage of the larger bore and reshape the combustion chambers to unshroud the valves and bump up combustion chamber cc's a bit.
If you don't know anything about how to do this, there are many companies that can port your heads and do some reshaping to get you what you want. Properly shaped combustion chamber will be a great advantage over the stock crap.
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Old 03-31-2006, 05:23 PM   #10
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Quote:
Originally Posted by ImprezaRSX
IF you are going to a 2.5L block, you should take advantage of the larger bore and reshape the combustion chambers to unshroud the valves and bump up combustion chamber cc's a bit.
If you don't know anything about how to do this, there are many companies that can port your heads and do some reshaping to get you what you want. Properly shaped combustion chamber will be a great advantage over the stock crap.
Absolutely correct

I was one of the first to run the 2.5L/wrx head combo in my WRX. A good de-shrouding helped pick up a little more cc and yielded a way better burn.

Good luck

Chris
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Old 04-04-2006, 07:54 PM   #11
chaingreyiv
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what language does he s peak
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Old 04-05-2006, 06:27 PM   #12
mistaboosta
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only turkish
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