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Old 01-11-2009, 01:16 AM   #1
Zac86
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Default EJ25 Heads on EJ22?

So i'm sick of not ever being able to find single port header so i'm thinking about getting some dual port EJ25 heads to put on my EJ22, will this work? I heard it really lowers compression which is bad!
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Old 01-11-2009, 10:54 AM   #2
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Something tells me that you could have a header made for less than the cost of getting the parts to convert your 98 EJ22 motor with phase II EJ25 heads. You're looking at the heads, exhaust manifold, INTAKE MANIFOLD, throttle body with IAC that works for you, and associated wiring changes.

Then there is the whole lowered compression issues to deal with.

Jay Storm
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Old 01-11-2009, 11:27 AM   #3
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It's only an option worth pursuing if you plan on boosting your car...
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Old 01-11-2009, 12:06 PM   #4
69subaru360
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Just pick up a set of 95 or older dual port EJ22 heads, you can find them cheap.
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Old 01-11-2009, 12:46 PM   #5
Zac86
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Quote:
Originally Posted by 69subaru360 View Post
Just pick up a set of 95 or older dual port EJ22 heads, you can find them cheap.
Are all ej22 heads the same? even the turbo ones?
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Old 01-11-2009, 01:09 PM   #6
69subaru360
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Quote:
Originally Posted by Zac86 View Post
Are all ej22 heads the same? even the turbo ones?
The old EJ22T heads have a ports for the lines, not sure of other differences.

90-94 EJ22 are the same. 95 EJ22 is dual port, 95 auto had a port for EGR. 96-98 went to single port, some had an egr port some didn't. I think somewhere along the line they switched from hydraulic to solid lifters. 99 went to the phase 2 heads.

This is off the top of my head, I may be a bit off, but it's close.
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Old 01-11-2009, 01:30 PM   #7
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In 98 they got rid of the hydraulic lash adjusters. I guess my best bet is to find another set of heads as I have allready planned to build them up anyways with new seals and delta cams.
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Old 01-11-2009, 08:26 PM   #8
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Quote:
Originally Posted by Storm View Post
Something tells me that you could have a header made for less than the cost of getting the parts to convert your 98 EJ22 motor with phase II EJ25 heads. You're looking at the heads, exhaust manifold, INTAKE MANIFOLD, throttle body with IAC that works for you, and associated wiring changes.

Then there is the whole lowered compression issues to deal with.

Jay Storm


Listen to this guy. Go to a shop and get a exhaust made. My brother got a entire exhaust made for $400.
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Old 01-11-2009, 09:35 PM   #9
Zac86
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But I have a single port exhaust and the flange going from the exhaust manifold to the catpipe is broken, can a muffler shop make a new one?
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Old 01-11-2009, 09:36 PM   #10
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Quote:
Originally Posted by 69subaru360 View Post
The old EJ22T heads have a ports for the lines, not sure of other differences.

90-94 EJ22 are the same. 95 EJ22 is dual port, 95 auto had a port for EGR. 96-98 went to single port, some had an egr port some didn't. I think somewhere along the line they switched from hydraulic to solid lifters. 99 went to the phase 2 heads.

This is off the top of my head, I may be a bit off, but it's close.
You don't want to use the turbo heads. Not only do they have the extra plumbing but they have smaller valves in them than the NA heads. They also have an extra vent bung on the covers on each of them that will require more vacuum plumbing. Obviously not the end of the world, but the valve size is the real reason you shouldn't use them.
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