iriejedi Posted July 8, 2018 Share Posted July 8, 2018 (edited) I have to get an engine together for an 2004 Outback EGR 2.5L. The old engine has a hole in the case. I have a good short block from a 2002 Outback that doesn't have EGR heads so I want to remove the EGR heads and install them on my good short block. I figured it would be best to mill those heads and have any other necessary work done to them before installing on this short block. My question is which company provides the most dependable headgaskets? Cometic? Six Star? Suggestions? Any thoughts and suggestions from people who have learned what's the best route via personal experience? Edited July 8, 2018 by iriejedi Quote Link to comment Share on other sites More sharing options...
montana tom Posted July 8, 2018 Share Posted July 8, 2018 (142713912360) ebay item # 642 Subaru MLS Pair $76.00 delivered No debate use at least these or the turbo head gaskets. Don't mill the heads ,Clean them up with 150 grit WD and then check for flatness. Check valve lash while you have them on the bench. 1 Quote Link to comment Share on other sites More sharing options...
Mike104 Posted July 9, 2018 Share Posted July 9, 2018 11044AA642 is the Multi Layer Steel gasket for the Non Turbo EJ25 motor 11044AA770 is the Multi Layer Steel gasket for the Turbo EJ25 motor Installed properly these will be best option. 1 Quote Link to comment Share on other sites More sharing options...
forester2002s Posted July 9, 2018 Share Posted July 9, 2018 I installed the 11044AA770 'Turbo Gasket' in my 2002 Forester EJ251 NA (Non-turbo) engine. It seals absolutely tight, without a hint of leakage. 1 Quote Link to comment Share on other sites More sharing options...
el_freddo Posted July 9, 2018 Share Posted July 9, 2018 I'll be going for the turbo gaskets on our EJ251 next. The stock replacement gaskets are leaking coolant externally after 80k km :/ i can't remember the part number used last time around... Cheers Bennie 1 Quote Link to comment Share on other sites More sharing options...
Mike104 Posted July 9, 2018 Share Posted July 9, 2018 57 minutes ago, el_freddo said: I'll be going for the turbo gaskets on our EJ251 next. The stock replacement gaskets are leaking coolant externally after 80k km :/ i can't remember the part number used last time around... Cheers Bennie Sadly if you take your car to a Subaru dealer they will generally install the gasket specified by Subaru. For many this is the 11044AA633 Gasket that IS NOT a Multi Layer Steel gasket 1 Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted July 9, 2018 Share Posted July 9, 2018 642's were used on early turbo models. 04-06 STi IIRC. So they are not strictly an NA gasket. They do fit the porting on the SOHC heads a little better but we have and continue to use 770's on every engine when the 642's are not available. The porting really makes no difference at all. GD 1 Quote Link to comment Share on other sites More sharing options...
iriejedi Posted July 9, 2018 Author Share Posted July 9, 2018 7 hours ago, GeneralDisorder said: 642's were used on early turbo models. 04-06 STi IIRC. So they are not strictly an NA gasket. They do fit the porting on the SOHC heads a little better but we have and continue to use 770's on every engine when the 642's are not available. The porting really makes no difference at all. GD GD, so you find the 642 to be more reliable than the 770? Or is there really no difference? I'm going to order something this afternoon and appreciate yours and everyone else's comments. BTW, for some reason I thought most people in this group were fans of the Cometic head gaskets. Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted July 9, 2018 Share Posted July 9, 2018 Cometic is ok - but I only use them if I need a special thickness. They are more expensive and less available than the factory gaskets. There is no real difference between 642 and 770 other than some minor cooling port shape differences. They don't matter and either work in every application in my experience. GD 1 Quote Link to comment Share on other sites More sharing options...
montana tom Posted July 9, 2018 Share Posted July 9, 2018 Here is the ebay item # for the 770's ( 141626599902 ) $87.00 pair delivered versus $76.00 for the 642 I've installed dozens of the 642 without incident. 1 Quote Link to comment Share on other sites More sharing options...
carfreak85 Posted August 14, 2018 Share Posted August 14, 2018 Just so I've got this straight: 11044AA633<11044AA642<11044AA770, with 770 being the go-to for all HG replacements? Quote Link to comment Share on other sites More sharing options...
montana tom Posted August 15, 2018 Share Posted August 15, 2018 The 642 is the one for everything . The 770 is overkill unless its a turbo. Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted August 15, 2018 Share Posted August 15, 2018 642 and 770 are basically interchangeable and we just use whichever best matches the head casting being used. GD Quote Link to comment Share on other sites More sharing options...
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