August 9, 200619 yr I just received my JDM 2.5 DOHC engine and the valve covers have "DOHC-16V" casted into the valve covers. Should obviously just be a valave cover change but maybe these engines had different head gaskets(new versions) installed from Subaru?
August 9, 200619 yr Could also be a difference in a first run ej25 and the later model ej25's also could depend on year of production I am sure.
August 9, 200619 yr Author Could also be a difference in a first run ej25 and the later model ej25's also could depend on year of production I am sure. Anyone know if/when the EJ25's DOHC got the new design head gaskets?
August 9, 200619 yr Anyone know if/when the EJ25's DOHC got the new design head gaskets?when the HG gets replaced it gets the new design nipper
August 10, 200619 yr Author when the HG gets replaced it gets the new design nipper GOOD ANSWER! I am ordering the overhaul gasket set either way from 1stSubaruparts since it's just not worth taking a chance on the HG's...just thought someone might have any info about the valve covers.
August 10, 200619 yr The '96 DOHC valve covers/heads have the raised letter casting you are speaking of. My old '97 DOHC valve covers/heads did not have the raised letter casting.
August 10, 200619 yr Author OK, so the engine maybe a 96 then..anyone know why this engine was rated at 10 horsepower less? The '96 DOHC valve covers/heads have the raised letter casting you are speaking of. My old '97 DOHC valve covers/heads did not have the raised letter casting.
August 11, 200619 yr OK, so the engine maybe a 96 then..anyone know why this engine was rated at 10 horsepower less? I believe that the '96 was the only 2.5 with hydraulic lifters. There were a number of revisions to the cams, lifters, combustion chamber shape etc. in '97. I could be wrong about this, but I think '96 2.5 DOHC may have required premium fuel as well. Joe Spitz 's site has some info on this if I recall correctly. Nathan
August 11, 200619 yr I believe that the '96 was the only 2.5 with hydraulic lifters. There were a number of revisions to the cams, lifters, combustion chamber shape etc. in '97. I could be wrong about this, but I think '96 2.5 DOHC may have required premium fuel as well. Joe Spitz 's site has some info on this if I recall correctly. Nathan 96 required premium, after that they didnt. nipper
August 11, 200619 yr Author I did a little research today and yes the 96 engines had hydraulic lifters vs solid starting in 97, they also revised the intake to achieve 10 more HP. I am swapping my intake onto the engine anyway so I'll have the new design and will see if the the lifters are hydraulic when I have the engine open for the new HG's...either way I'll probably leave whatever is in there alone.
August 11, 200619 yr Author Interesting that 1stSubaruParts lists only one head, lifter, camshaft design for the model years 96-98?
August 11, 200619 yr Author 96 required premium, after that they didnt. nipper Any idea why premium fuel? It can't be the lifters but maybe something in the intake/ignition which will be swapped over from my old engine...hate to have to use premium now.
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