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Old 09-13-2017, 05:23 PM   #1
03SubyWRX
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Member#: 200767
Join Date: Jan 2009
Chapter/Region: NESIC
Location: Manchvegas, NH
Vehicle:
2007 OBS 5MT
Lifted

Default Head Gasket for EJ253?

Hi Guys -

I have a 07 OBS with the EJ253 that has bad valve seals. I picked up a spare set of heads, had my machine shop go through them (valve job, new springs/seals/guides, and decking), and I sent the cams out to Delta for their torque grind.

I am trying to choose what head gasket to use. I don't want to use the OEM Subaru EJ253 gasket because it's still a ****ty single layer design. I'm looking at either the OEM Subaru EJ257 gasket (04 STi, don't have the PN atm), or the Cometic gasket for the EJ253 since both of these gaskets are MLS.

I understand the OEM Subaru EJ257 is thinner than the EJ253 gasket. Will this be an issue in terms of piston and/or valve clearance? Again, I'd prefer to use an OEM gasket, but if piston/valve clearance is an issue with the OEM Subaru STi gasket then I will go with the Cometic gasket.
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Old 09-15-2017, 05:22 PM   #2
03SubyWRX
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Join Date: Jan 2009
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2007 OBS 5MT
Lifted

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Bump, looking for advice.
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Old 09-15-2017, 06:24 PM   #3
Preludicrous
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Location: Tucson AZ
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2006 2.5i Wagon
SRR

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I'm pretty sure you can use the STi gaskets with no issue. It's been discussed in this forum before, you can probly find at least a couple threads about it.
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Old 09-15-2017, 11:41 PM   #4
93stiImperza
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CFBlue IAG STAGE 4 BLOCK

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For the ej253 oem headgasket they do make a updated 3 mil gasket. I was able to find update part# Just bout a set thru ebay a few months back for a side job. Or go with a felpro set they as make a et to.
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Old 09-19-2017, 07:46 PM   #5
Bluefoton
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Location: Quebec, QC
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2008 2.5i-hatch -
now with a HID retrofit

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The Sti one should work. Part nr.... 642. That's the one I used when mine blew on my old EJ251 - it's a MSL design.
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Old 09-20-2017, 03:09 AM   #6
terrainasaurus
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bump. me interest 2
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Old 09-20-2017, 11:14 PM   #7
jamal
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Yeah use 11044aa642.

Newer ej25s, like 09+ have different passages in the heads so you need to use the 07+ sti gaskets. I think it's the same part number between the n/a and turbo cars anyway. ...770 I think.
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