Ej20g Vs. EJ25 DOHC drilled and tapped pics

PhyrraM · Post by **PhyrraM** » Mon Feb 25, 2008 4:19 am

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.

vrg3 · Post by **vrg3** » Mon Feb 25, 2008 4:27 am

Wow, very useful pictures, thanks!

asc_up · Post by **asc_up** » Mon Feb 25, 2008 10:43 am

Neat.

BTW, that Legacy EJ20G is soooo clean. Holy Hell. Lol.

BXSS · Post by **BXSS** » Mon Feb 25, 2008 8:59 pm

+1 good info/pics

I see a grid cast on the block, was it closed deck?

PhyrraM · Post by **PhyrraM** » Mon Feb 25, 2008 10:55 pm

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.

Arctic Assassian · Post by **Arctic Assassian** » Mon Feb 25, 2008 11:09 pm

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.

PhyrraM · Post by **PhyrraM** » Mon Feb 25, 2008 11:26 pm

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.

Arctic Assassian · Post by **Arctic Assassian** » Tue Feb 26, 2008 1:58 am

GOTCHA. I was told to stay away from HLA's like bad acid.

All_talk · Post by **All_talk** » Wed Feb 27, 2008 5:36 pm

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

Arctic Assassian · Post by **Arctic Assassian** » Wed Feb 27, 2008 6:09 pm

That is awesome.

FuJi K · Post by **FuJi K** » Mon Mar 10, 2008 12:08 am

56cc eh??? Not 49cc like the USDM WRX heads.....
good info!

BXSS · Post by **BXSS** » Mon Mar 10, 2008 5:02 pm

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.

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Ej20g Vs. EJ25 DOHC drilled and tapped pics

Ej20g Vs. EJ25 DOHC drilled and tapped pics