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Old 08-16-2018, 10:08 PM   #76
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Old post but how long did it take on your 05 (non AVLS AVCS) motor? How feasible to do on motor in vehicle?
It is possible to do it in the engine bay but it SUCKS. I also don't think you'll do as good of a job. Cleaning and resealing the camp caps is hugely difficult in-car and setting the valve lash isn't nearly as accurate without pulling the engine. For your first time doing any of this and doing it in-car, figure 8-10 hours if you're pretty familiar with working on your own car.


OTOH, when I was working on these daily, it took me 100 minutes to pull the engine, 90 minutes to do the cam swap, and 120 minutes to put the engine back in the car. So about half the time to do it via pulling the engine and the final result was better done.
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Old 08-17-2018, 11:07 AM   #77
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Default 2006 Subaru 2.5i Delta Cam Install

Ok thank you. You don’t pull the heads once the motor is out if not needed, right? I was hoping to avoid removing motor until I needed to do bottom end otherwise I’ll get into the old “while I have the motor out, might as well...” heh.
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Old 08-17-2018, 11:35 AM   #78
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It is possible to do it in the engine bay but it SUCKS. I also don't think you'll do as good of a job. Cleaning and resealing the camp caps is hugely difficult in-car and setting the valve lash isn't nearly as accurate without pulling the engine. For your first time doing any of this and doing it in-car, figure 8-10 hours if you're pretty familiar with working on your own car.


OTOH, when I was working on these daily, it took me 100 minutes to pull the engine, 90 minutes to do the cam swap, and 120 minutes to put the engine back in the car. So about half the time to do it via pulling the engine and the final result was better done.
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Ok thank you. You don’t pull the heads once the motor is out if not needed, right? I was hoping to avoid removing motor until I needed to do bottom end otherwise I’ll get into the old “while I have the motor out, might as well...” heh.
I would start with 2 rounds of Gunk Foamy EngineBrite to get the bay clean.
Heavy blanket on the fender, maybe an antidepressant and start to work.

Some of us have an engine hoist. While you "can" do some work engine in, why?
No, no need to pull heads if doing cams.
I would also highly think of a full valve cover set while the covers are off, maybe plugs, timing belt, etc.
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Old 08-17-2018, 11:54 AM   #79
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Ok thank you. You don’t pull the heads once the motor is out if not needed, right? I was hoping to avoid removing motor until I needed to do bottom end otherwise I’ll get into the old “while I have the motor out, might as well...” heh.
You don't have to pull the heads but the odds of finding an EJ-series engine without a head gasket leak...

As noted, you'll need to do valve cover gaskets, as well as the front and rear cam seals. The rear ones seem to confuse the hell out of most parts counter guys, sadly. You'll also need Fujibond or at least Ultra Grey to glue the cam caps back on. The cam caps require a small-ish hex bit as well as a Torx Plus bit. IIRC it's a Torx Plus 40, but it's been a long time so I'm not 100% sure of the size. I am 100% sure it's a Torx Plus, though, and you MUST have the right bit for it.

May as well check the clutch, timing components, and the oil pan as well.
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Old 08-18-2018, 06:54 AM   #80
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Default 2006 Subaru 2.5i Delta Cam Install

Ok cool. Yeah we just did headgaskets,
Clutch, timing components and oil pan. Unfortunately at the time it was my only car and daily driver. It would have been the perfect time for cams but it wasn’t on my mind at that time!!! Wondering what the power potential is here on a 10psi supercharged 253. I am hoping cam will drop boost(less restriction) quite a couple psi. Hoping it’d pick up at lest 25whp on my setup but I think more is possible.

Last edited by pcampbell; 08-18-2018 at 07:06 AM.
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Old 08-18-2018, 11:46 AM   #81
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Ok cool. Yeah we just did headgaskets,
Clutch, timing components and oil pan. Unfortunately at the time it was my only car and daily driver. It would have been the perfect time for cams but it wasn’t on my mind at that time!!! Wondering what the power potential is here on a 10psi supercharged 253. I am hoping cam will drop boost(less restriction) quite a couple psi. Hoping it’d pick up at lest 25whp on my setup but I think more is possible.
I have not done cams on a supercharged EJ253 but for every other application I've done it on and every single cam profile for the EJ253, 25whp is hugely unrealistic.
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Old 08-18-2018, 05:24 PM   #82
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What kind of impact do you see on a turbo 253 if you’ve done that before?
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Old 08-18-2018, 05:47 PM   #83
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What kind of impact do you see on a turbo 253 if you’ve done that before?
Regardless of what the stamp on the block said, it wasn't close enough to a 253 anymore to count

Can't help you there.
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Old 08-18-2018, 06:17 PM   #84
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Any forced induction with sohc heads?
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Old 08-18-2018, 06:20 PM   #85
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Yeah, did a Ej253 with high compression pistons, a proper header, valve work, mild port, I don't remmeber what the guy was running for boost though. He tried several different cams, profile with the biggest gain was IIRC ~9% and that came at the expense of making it super peaky.
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Old 08-20-2018, 05:53 PM   #86
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That is a lot less than I would have anticipated. I remember reading vicious fishes saying 25% gains with exhaust and cam with a Raptor SC (what I run). I am not sure how much of that was cam and how much was exhaust. I am going to reach out to him.
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Old 08-20-2018, 05:58 PM   #87
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If he went from a stock header to a TWE header, he actually should have seen even bigger gains than that. I had one NA 2.5L gain ~40hp over stock with just the header change (dynoed before and after). More typical gains from a stock header to TWE are about 30hp.
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Old 08-21-2018, 05:24 PM   #88
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Ahhhh nice.
Unfortunately I can't use those headers. My heads are 2004-2005 single port exhaust. They are EL from the factory but lots of catalytic converters in there heh. The solution would probably be to cut out some of those cats out for high flow units .
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Old 08-21-2018, 11:06 PM   #89
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Ahhhh nice.
Unfortunately I can't use those headers. My heads are 2004-2005 single port exhaust. They are EL from the factory but lots of catalytic converters in there heh. The solution would probably be to cut out some of those cats out for high flow units .
If you're using the pre-2006 2.5L SOHC heads, Tom at TWE absolutely makes headers that work. Those are the ones I've seen the biggest gains on. The 4-2-1 EL High Output headers he made for me on my personal car picked up 40hp over stock and 20hp over the next-best equal length headers I tested. That's on the stock 2005 2.5RS SOHC heads.

Unless you're working with heads from some odd part of the world that used a different head design than the "normal" design for that timeframe.
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Old 08-22-2018, 07:31 AM   #90
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If you're using the pre-2006 2.5L SOHC heads, Tom at TWE absolutely makes headers that work. Those are the ones I've seen the biggest gains on. The 4-2-1 EL High Output headers he made for me on my personal car picked up 40hp over stock and 20hp over the next-best equal length headers I tested. That's on the stock 2005 2.5RS SOHC heads.



Unless you're working with heads from some odd part of the world that used a different head design than the "normal" design for that timeframe.


Hah. Yeah odd part of the world being California. They’re 2 year only one off heads, intake and exhaust.
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Old 08-22-2018, 11:55 AM   #91
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Hah. Yeah odd part of the world being California. They’re 2 year only one off heads, intake and exhaust.
Might be worth joining the union and swapping heads.
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Old 08-23-2018, 07:48 PM   #92
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Williaty the twe headers added 30whp? I have a 2006 2.5i and have begun researching what "bolt ons" I can do to gain some power. I know that cams and headers offer the best gains other than forced induction but I didn't realize it was that much. Would you recommend going for headers first then? I did see your posts about hybrid intakes versus CAI and SRI and that was a good write up!
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Old 08-23-2018, 08:05 PM   #93
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Your 2006 is completely different in the heads, valves, and exhaust. No idea what you'll see as gains, though I have heard some of the newer guys still speak favorably of Tom's headers for their cars.

Yes, headers are the ONLY thing I'd recommend to make power on a non-turbo EJ25 unless you're prepared to spend $20-$30k to properly do a full engine build and custom tune on a load holding dyno. Nothing else provides enough HP per Dollar to justify bothering with.
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Old 08-24-2018, 12:33 PM   #94
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No point in spending that much money on it when you can just do an engine swap for cheaper or just buy a faster car lol. I've seen a few people have done the raptor or m62 on the ej253. Just debating what I want to do and how much I want to spend. Would header and cams be a good N/A option for the 2006?
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Old 08-24-2018, 12:48 PM   #95
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No point in spending that much money on it when you can just do an engine swap for cheaper or just buy a faster car lol. I've seen a few people have done the raptor or m62 on the ej253. Just debating what I want to do and how much I want to spend. Would header and cams be a good N/A option for the 2006?
Bingo. That's the point I always tried to hammer into my clients' heads. If you want power, just pay me to swap in a EJ257, wiring harness, and 6MT. It'll cost less than a full NA build, make a crap ton more power, and then you still have hundreds more HP you can gain by modding the turbo. Trying to make power out of a NA Ej25 isn't for people who want to go fast, it's for people who want to prove a point.

That being said, my personal engine has (well, had. I don't own a Subaru anymore) the TWE headers and that made it more than sprightly enough for normal use.
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Old 08-25-2018, 03:09 AM   #96
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Bingo. That's the point I always tried to hammer into my clients' heads. If you want power, just pay me to swap in a EJ257, wiring harness, and 6MT. It'll cost less than a full NA build, make a crap ton more power, and then you still have hundreds more HP you can gain by modding the turbo. Trying to make power out of a NA Ej25 isn't for people who want to go fast, it's for people who want to prove a point.

That being said, my personal engine has (well, had. I don't own a Subaru anymore) the TWE headers and that made it more than sprightly enough for normal use.

Im thinking of swapping ej257 soon. Im gonna need your help.
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Old 08-25-2018, 05:52 AM   #97
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Default 2006 Subaru 2.5i Delta Cam Install

SC is good if you are fine with 200whp but it’s hard to stop there. That’s a stock XT. I’m trying to squeeze 250 out of the SC setup without going too crazy (stock motor). It also drives differently. And I can change my plugs in 20 minutes but I can’t see getting much more power even if you built the motor. I am running the smallest pulley you can run on this model due to SC rev limit (50kish rpm)

I am still surprised the headers would be such a restriction so I’m going to try that.

Another option is a total budget eBay turbo setup. I feel like you could get it running for like $1k ish.

Last edited by pcampbell; 08-25-2018 at 01:40 PM.
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Old 08-27-2018, 10:48 AM   #98
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@Williaty Yea I've wanted to do things to it but haven't pulled the trigger yet on anything just because of the vast amounts of misinformation out there and trying to find real proof of power gains and for the $ to HP ratio you get from the EJ253 its just not worth it IMO.

Also as far as the header being a big restriction I believe they have catalytic converters in the headers iirc.
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Old 07-14-2019, 04:08 PM   #99
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Answer this question:
Did you notice seeing any small springs and pistons (or lose any of them) when removing the intake rocker arm?

Does anyone have a part number for the variable valve springs and pins that are used int he intake rocker arm assembly?
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Old 07-14-2019, 08:37 PM   #100
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I can post them tomorrow.
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