MilesFox Posted November 10, 2013 Share Posted November 10, 2013 (edited) So i have a forester engine for the ej25d block, and just got a set of phase 1 first gen legacy ej22e heads, dual ports. I also got a set of ej22e composite HG's. I have alredy done a frankenmotor using he cometic hybrid MLS gaskets. Considering i have all the parts, but don't have the 200 bucks for cometics, soes anyone see a problem withusing the composite head gaskets on the ej25d block. I will be using the ej22e heads with their original head bolts. And i will also have to port match the water jacket. Pros and cons? Opinions? (have i asked this before? MY car has some farmer built straight pipe and won't pass emissions, and i have a catte mid pipe to use(with dual port header), but the engine in my car is single ports, and i could put a dual port engine together to swap in sooner than i can find a single port header. Edited November 10, 2013 by MilesFox Quote Link to comment Share on other sites More sharing options...
darsdoug Posted November 10, 2013 Share Posted November 10, 2013 I think you should try them regardless of my own selfish curiosity whether or not the higher compression will cause them to fail? Quote Link to comment Share on other sites More sharing options...
MilesFox Posted November 10, 2013 Author Share Posted November 10, 2013 (edited) I would try this for my own curiosity. You are welcome to the results if (when) i do. I fi remember right, the rule to apply is use the gasket that goes to the head. I can see where this gets confused using MLS with phase 2 engines. Both the ej25d and the ej22e are open deck blocks. Now, do the phase 1 dohc engines in the overseas markets WRC era 90-95 use composite or MLS? Edited November 10, 2013 by MilesFox Quote Link to comment Share on other sites More sharing options...
MilesFox Posted November 10, 2013 Author Share Posted November 10, 2013 Also, I am supporting the idea of composite gasket considering the head bolts on ej22e are external allowing for re-torque without removing cams or valve covers. Quote Link to comment Share on other sites More sharing options...
Gloyale Posted November 10, 2013 Share Posted November 10, 2013 I would try this for my own curiosity. You are welcome to the results if (when) i do. I fi remember right, the rule to apply is use the gasket that goes to the head. I can see where this gets confused using MLS with phase 2 engines. Both the ej25d and the ej22e are open deck blocks. Now, do the phase 1 dohc engines in the overseas markets WRC era 90-95 use composite or MLS? NO you need a gasket for the block. The fire ring on the 2.2 gasket will be too small for the larger 2.5 bore. That's the problem....you need a gasket with water ports that match a 2.2 head, and a bore size to match the 2.5 block. Or drill the gasket to match the 2.2 heads Quote Link to comment Share on other sites More sharing options...
MilesFox Posted November 10, 2013 Author Share Posted November 10, 2013 Ok, i see now. I failed to take that into consideration. Gasket matches the block, then. Too bad there isn't an aftermarket composite 2.5 gasket. Quote Link to comment Share on other sites More sharing options...
MilesFox Posted November 11, 2013 Author Share Posted November 11, 2013 I found an article pertaining to subaru HG failures, and in the article it states that the 1996 ej25d used the composite HG before switching to MLS in 97. http://allwheeldriveauto.com/subaru-head-gasket-problems-explained/ Quote Link to comment Share on other sites More sharing options...
Caboobaroo Posted November 13, 2013 Share Posted November 13, 2013 Yes, the '96 2.5 had a composite head gasket. Quote Link to comment Share on other sites More sharing options...
Jerry DeMoss Posted November 13, 2013 Share Posted November 13, 2013 Just use '05 mls sti headgaskets. Works great with the ej22 heads on a ej25 block. No complaints from any of these I have done. 1 Quote Link to comment Share on other sites More sharing options...
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