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Old 05-24-2014, 07:20 PM   #1
saab90089
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Default Identify EJ25 block - out of ideas

I have done quite a bit of research (SubaruForester.org, NASIOC, RS25.com, UltimateSubaru.org) and am still having problems identifying this short-block.

I have reasons to believe it is a Phase I and reasons to believe it is a Phase II. I am wanting to identify whether it's Phase I or II so that I can order the appropriate head-gaskets for it.

Any input anyone can provide me would be VERY helpful. If anyone has any questions to help narrow it down, please feel free to ask.

Evidence it is a Phase I:
- Pistons have a square dish in them
- Pistons protrude above deck by very small amount (I will measure tonight)

Evidence it is a Phase II:
- Bell housing threaded holes match that of Phase II
- Thrust bearing is located at #5 (used piece of sheet metal as 'depth gauge' compared to a known Phase II)
- When block was purchased it was said to be a 1999 Impreza (Phase II from what I've read)

I thank everyone in advance.

Ian Cooper
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Last edited by saab90089; 05-24-2014 at 08:30 PM.
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Old 05-24-2014, 07:42 PM   #2
Zefy
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Default

you may have both.

99 was a transition year. As far as I know, they all had the phase 2 block, but some still had the DOHC. Hence why your pistons look like DOHC but your bottom end looks like phase 2. It is also likely to be from a legacy or something as the 2.5 was used in almost everything.
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Old 05-24-2014, 08:11 PM   #3
saab90089
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Below is a picture of the pistons and the deck:


Below is a picture of the inside of the bell housing. Bad picture but one can see the number of holes for bell housing bolts.


From what I have read these numbers are to ID each block half:


I read on one website noting this was the engine number but it seems there is not way to look it up:


I understand these identify which pistons are used:


Front of engine:


Top of block:
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Old 05-24-2014, 08:16 PM   #4
saab90089
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Quote:
Originally Posted by Zefy View Post
you may have both.

99 was a transition year. As far as I know, they all had the phase 2 block, but some still had the DOHC. Hence why your pistons look like DOHC but your bottom end looks like phase 2. It is also likely to be from a legacy or something as the 2.5 was used in almost everything.
Zefy - thanks for the input!

I had wondered if that is what I had. I was not sure if it was a common for the 1999 engines?

Do you/others think it was a rare 99 Impreza with the DOHC engine?
Or could it be possible that it was a SOHC engine with DOHC pistons?

Keep the ideas coming!

Thanks,
Ian Cooper

Last edited by saab90089; 05-24-2014 at 08:27 PM.
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Old 05-25-2014, 12:03 AM   #5
Subie-Lifer
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just buy dohc gaskets they will be thicker and you won't get any piston to head contact I promise. That black plastic breather plate is a good identifier of a phase 1 motor.
Change that over to metal before install or it'll leak
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Old 05-25-2014, 10:42 AM   #6
saab90089
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I agree, probably best to just use the thicker gaskets and call it done.

I do have a metal breather plate and was planning on replacing the plastic one with it.

From what I am putting together I think this engine was a DOHC. However it had adopted some Phase II stuff (#5 thrust bearing and 8 threaded holes bell housing). Further unique I think it was put into a 99 Impreza (I'm told there were a very small number of DOHC 99 imprezas).

Please keep the suggestions/idea coming along.

Ian Cooper
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Old 05-25-2014, 01:03 PM   #7
daslog
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Does the VIN on the short block match your car's VIN?
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Old 05-28-2014, 09:12 AM   #8
saab90089
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Unfortunately I do not have a way to contact the person who owned the car this short-block came out of.

Ian
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Old 05-28-2014, 02:16 PM   #9
Zefy
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99 2.5TS (DEAD) / 87 GL

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Old 06-10-2014, 10:31 AM   #10
saab90089
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89 900Turbo w/295K
97 Impreza L wagon

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Sorry to resurface this thread but I wanted to thank everyone for their input. Based on my research and the wonderful input on the forums I have come to the following conclusion....

The engine is a DOHC engine from 1999 (uniquely from an Impreza) and therefore I need to use the DOHC gaskets. Since it's a 1999 it has some advantages: 8 threaded holes in bell housing (easier to mount to 2002 transmission/starter) and thrust bearing at #5 (improvement over #3 location).

I have finished lapping the valves for this engine and have order needed parts. I am hoping to assemble this DOHC block/SOHC heads engine this weekend.

Ian
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Old 06-10-2014, 10:22 PM   #11
geronimo81
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How do you know it came from an impreza? I don't know of any '99 2.5RS's with DOHC. They were SOHC with a MAF.
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