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Old 08-05-2019, 09:39 PM   #1
anarchyx34
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Default Need help from EJ25 peeps. What's up with these pistons on my '05 Legacy?

Long story short, I picked up a dirt cheap (but clean) N/A '05 Legacy that had a "broken timing belt" (it actually was a sheared tensioner bolt). I pulled the heads and eventually realized the car has the wrong heads. It's got dual port heads but the single port exhaust. So either this thing had a head swap at some point, or the entire motor. I'm not sure which.

The pistons are what gets me though. I was a subaru tech in the mid '00's and I don't remember the pistons looking like this.


What's with the dual valve reliefs? At first I thought the valves made those marks but some of them didn't even hit (there was only 4 bent valves in total). Besides they're all carboned over. If the valves hit them they'd look fresh.

So... what am I looking at here?

If this is how they normally look then I'll just slap the correct heads on and call it a day because the rest of the motor is spotless. AFAIK pretty much all N/A EJ25 blocks are interchangeable anyway right?
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Old 08-05-2019, 11:07 PM   #2
Blktrax
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Well , thatís a new one to me... not Cali Spec pistons , and single exhaust port on each head would be Cali spec as well.

I think that has to be some type of Jasper , ATK, Fed/Mogul reman shenanigans.
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Old 08-06-2019, 07:16 AM   #3
anarchyx34
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So those are non-cali spec pistons? What's difference with the Cali spec ones?

The heads are dual port. They've been running it like this:





So it seems the whole motor was replaced with a non-cali spec one. So the big question is there any reason I can't just use this short-block with cali-spec heads?

Last edited by anarchyx34; 08-06-2019 at 10:06 AM.
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Old 08-06-2019, 10:25 AM   #4
anarchyx34
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Just something I've found. I was looking for a picture of the difference between CA and non CA pistons and found this:

https://www.google.com/catalog/20...iston_set.html

So if this is to be believed, Non-CA means dished pistons, CA means non dished pistons. Which would mean that I do have CA pistons, but that doesn't explain the extra set of valve reliefs that just straight up look weird to me.
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Old 08-06-2019, 12:49 PM   #5
anarchyx34
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Ok another update. Someone on reddit said they look like IKON pistons, so I looked it up, and holy **** he's right.



That would be really odd for high performance forged pistons to make their way onto a bone-stock automatic N/A legacy. I'm going to guess that these are just regular aftermarket cast replacements. But the thing I learned is that the 8 valve reliefs are so the pistons can be used on either side. Never seen some **** like this before but I think it's ok to use.
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Old 08-06-2019, 03:18 PM   #6
anarchyx34
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Gets even weirder. I just looked at the engine again. It's an EJ20.
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Old 08-16-2019, 07:05 PM   #7
tipsymechanic
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Quote:
Originally Posted by anarchyx34 View Post
Gets even weirder. I just looked at the engine again. It's an EJ20.
I'd say that's your problem right there!

I can't even fathom how bad it must have run with that exhaust setup!
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