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Ej20g Vs. EJ25 DOHC drilled and tapped pics
Posted: Mon Feb 25, 2008 4:19 am
by PhyrraM
I took some time to straighten out the garage a bit. Snapped a few pics because it seems to have come up quite a bit lately. Maybe these can be used to replace the ones that have gone missing from the old thread.
Please forgive the gaudy color-coding. I was trying to make it as easy to understand as possible. I've got a few more angles if anybody would like to see those too.
These are Legacy/Liberty Ej20g heads. Not Impreza/WRX ones.
Posted: Mon Feb 25, 2008 4:27 am
by vrg3
Wow, very useful pictures, thanks!
Posted: Mon Feb 25, 2008 10:43 am
by asc_up
Neat.
BTW, that Legacy EJ20G is soooo clean. Holy Hell. Lol.
Posted: Mon Feb 25, 2008 8:59 pm
by BXSS
+1 good info/pics
I see a grid cast on the block, was it closed deck?
Posted: Mon Feb 25, 2008 10:55 pm
by PhyrraM
BXSS wrote:+1 good info/pics
I see a grid cast on the block, was it closed deck?
Yes it is. I believe that all the Legacy Ej20Gs were closed deck. If not all, then most. I'm sure somebody, such as MattM can say for certain.
Posted: Mon Feb 25, 2008 11:09 pm
by Arctic Assassian
Those 25 heads are hla correct? Notice the difference in hatching on the heads, the 2.5 has opposing hatch marks, whereas the 20g has parallel marks.
Posted: Mon Feb 25, 2008 11:26 pm
by PhyrraM
The Ej25 head in the pic is shim over bucket. No hydraulic adjusters that I can see. The cam operates directly on the bucket. Which, in turn, operates the valve.
The Ej20g head is HLA or stub rocker. The cam operates a rocker arm that 'floats' between the valve, the HLA 'pill' and the cam itself.
You can see the shims in this picture if you squint. The valve train is removed on the Ej20g.
Posted: Tue Feb 26, 2008 1:58 am
by Arctic Assassian
GOTCHA. I was told to stay away from HLA's like bad acid.
Posted: Wed Feb 27, 2008 5:36 pm
by All_talk
There are HLA EJ25 heads, they come from the '96. The cams still ride right over the buckets (no followers like the 20G), but the buckets have a HLA built into them. You can spot them from the outside by the valve covers.
EJ20G
'97+ EJ25 DOHC
'96 HLA EJ25 DOHC
Another note, the '96 HLA heads have the larger combustion chambers (56cc) like the 20G heads.
Gary
Posted: Wed Feb 27, 2008 6:09 pm
by Arctic Assassian
That is awesome.
Posted: Mon Mar 10, 2008 12:08 am
by FuJi K
56cc eh??? Not 49cc like the USDM WRX heads.....
good info!
Posted: Mon Mar 10, 2008 5:02 pm
by BXSS
Wiseco has Head cc's listed as 46.6 cc's for both DOHC ej25 (Imprezas, Legacys, Foresters) & Legacy Turbo (SSs) ej22ts.
http://www.wiseco.com/Catalogs/Automobile.aspx
Is that correct?
If it is the 2.5 DOHC heads should have stock ej22t compression when used on a ej22t shortblock.