Subaru EJ Block Comparisons
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- เผยแพร่เมื่อ 9 ก.พ. 2025
- The video we posted yesterday raised a few questions regarding various upgrade paths when it comes to building a Subaru EJ engine. In this video Brett addresses those questions as he compares 3 separate builds we're currently working on and the differences between them.
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Brett thanks for taking the time to explain all of this, really helpful to actually see the engines side by side and have someone point out the differences
I love these informing-comparatives on the ej series!! I want to know all the difference between all the blocks and heads for the ej20, ej22, and ej25 series!! Thank you for all of these videos mate!
Any help where tl get those studs
I have an 04 Usdm Sti and I engine swapped for an Ej207 Version 7 (03 Jdm Sti) The Ej207 feels way faster than the Ej257. EJ207 pulls all the way to 7k and the Ej257 dies off at 6k rpm. I highly recommend.
The 207 redline is 8k bro. And the 257 is 6800
@@stephenhui2246 I have the Ej207 V7 but Im still using the Usdm Ecu because I wanted to keep using my Cobb Accessport. The Ej257 revs up to 7k but the Powerband dies of at 6k.
@@stephenhui2246 I agree the ej207 rev up to 8k. But mines is at 7k with Usdm Ecu. I have a couple vids on my channel also a couple Races.
@@bikboi8768 Hey man. I am thinking about doing the same thing (ej207 into ej257 based car). What modifications do I need to do? My car is a 2013 STI GRF Euro spec. Planning to use the ej207 block from the same generation.
@@8828RR
* I had to reuse my (Ej257 headers) because of the "drive by wire" that the Ej207 doesn't have.
*We had Swap the Cam Sensors also the Cams
*The TGV was also changed from the Ej257 -> Ej207
And that's it.
I keep my stock "Usdm Ecu" because it's a huge hassle to install the "Jdm Ecu."
Check out how my Ej207 V7 run. Got some videos might motivate you.
What is the number of power can hold ej207 stock? Thanks
Great video, what is the maximum boost and horse power can the standard EJ257 block handle before close decking is required? Also, what can the standard cast EJ257 pistons reliably handle in terms of boost and hp? Thanks
Thanks for the detailed information Brett.
@MRT PERFOMANCE WILL THE KILLERB PAN OIL PICK UP AND BAFFLE FIT THE 2004 2.5 Subaru Outback limited
*This is why EJ20 is the best engine period.*
I Agree, the V7 Ej207 and the EJ20g Closed deck were the 2 most iconic subaru 2.0 Litre engines.
Nice video mate wondering basic rebuild cost for my99gc8 ej205 any tips or advice I would be greatful for thanks mate hkeep up the good videos
Hi Bret great video. I have a v2sti std ej20 currently and have an offer for an ej257 short block, is this interchangeable ? What if any modifications will be needed ?
Cheers
Hey,
I've been eager to rebuild the engine out of my 06 subaru lgt and throwing in all the goods in the bottom end pistons, rods, crank etc. I'm just wondering what the deck looks like before I proceed, will it be an open deck?
Thanks a lot to MRT! A huge audio quality improvement over the past videos is that you finally got a better mic... FINALLY.... keep the vids coming you awesome guys! Another question: Does the 2009-2012 spec C model engines have the same 2L open-deck blocks as shown in your video? Or they are special close-decked 2L? Thanks :-D
hmm, I would have to check as we dont get many here in OZ
:(
Thanks for your reply! How about GD chassis spec C engines? I think the GD and GR spec C cars are using the same engine.
The 09-12 GRB has slightly different EJ207 (v10), still open/semi closed block but it has slightly thicker cylinder wall of 13mm vs the older EJ207 featured here that has 9mm walls. However the newer EJ207 on the GRB has hypereutectic pistons vs forged on this v7
WOW! Thank you very much for the insights! Can I assume that the EJ207(V10) still come with nitrated crankshaft and forged rods?
It turned (but i may be wrong) out my newly bought GC8 has some piston slap :( Now im wandering how long it can run like this before rebuild because i've spend all my money on that car
Ok what about the 04 forester xt. I think i heard it has a ver 1 ej255? Now is that the same as the ej 255 you just showed?
Is there a difference between a V7 and V8 sti block?
Would you close deck an ej204 and use that in place of an sti/ wrx block?
Hi brother, I’ve got an 08 STI version 11 2litre manual hatchback. It just stamped EJ20 on the engine. I’m just really confused after seeing your videos wondering if it’s actually an sti or not?! Could you please verify.
Great info thanks for sharing your experience.... You said the 2.0l can take a fair bit of boost.... What is a fair bit a boost? Would you mind sharing what you consider to be a good reliable range for a complete factory standard engine? I'm just curious. Thanks again MRT
hm, thats hard to say as it varies heaps with mods and the tune, more than 20 psi, but i would say LESS than 25
Awesome videos. Great information, thanks!
Is there a way to tell the difference in ej255 and ej257 just by cast numbers?
Would like to buy one for his 03 wrx
Love all your vids Brett. In the states we never had the pleasure of the 90s wrx/sti. Still in the planning phase for an RS swap but hoping to make a reliable 350whp on pump gas 93aki fully built longblock. Which would be best in terms of weight, reliability, and just fun to drive? 205/255? Gonna stick with USDM for ease of swaps.
Question...is an 05 EJ 20 block from a wrx the same as an 04 EJ 25 from a forester? I want to switch the blocks on both motors and keep the EJ 25 but not sure if the pistons and crank will match. Thanks!
Hello , do you have details about ej204 AVSC motor in regards to the cylinder wall thickness and also in the internals, are they the same motor as the ej205 except the turbo?
MRT, great video again, but one question. When you close your decks the surface for coolant around the cylinders gets much smaller - wouldn't it be a source of cooling issues?
100% reliable and this design has been used for many engines
Ok, thank you. BTW Would it be possible to share a few secrets about technology of closedeckig? ;)
Thank You Very Much for the info you are putting out here!!! Do you guys ship blocks to the US? And if so, what kind of shipping charges are entailed?
Thanks for your videos.
Are the pieces used to make a block closed deck available as a kit?
Adrian00702 I’m after the same answer
Just get an IAG block
Hi guys, I've read that Forester 2.5 XT year 04 and 05 (pre-facelift) share the same longblock as WRX STI 04, except having a smaller turbo and IC. I am really interested see if this is true?
Hey Brett, can you build me a motor? Thanks!
Can you use 97 ej25d heads on a ej205 block and a 2.5 crank?
I'll actually make a bit of a comment. The factory standard EJ207 you're showing looks to be a EJ207 "Thick Walled" block. I'm not sure about when they started producing those and whether they're standard issue in late model cars or not. It just looks substantially bigger than the GD-era EJ207. The EJ207 that has been closed-decked appears to be is a normal EJ207, but that may be the fact that liners have been inserted.
it could be a W20 EJ207?
It appears so. they came out of the JDM GRB WRX STi
So for a engine rebuild on USDM, should I get jdm EJ20 or EJ25?
Depends on what your original engine is and if AVCS is involved.
EJ207 if possible
So from watching a couple of your videos I could conclude of the EJ series that?:
EJ207>EJ257>EJ255>EJ205
EJ22>All EJ20/25 :)
@@Nwrig004 yeh definitely but there is 400 of them haha I have seen one at a car show though! Was unbelievably wide car, looked beautiful
@@Dacommenta just talking about an engine not a car
@@daviddunn5169 yeh of course.
For a EJ253 rebuild, can I use the shortblock from an EJ251 and put on the heads from my EJ253 to use in a 06+ Subaru (with ACVS), or is there something incompatable between them?
ej253 has dome top pistons and ej251 doesnt.
@@Mi11z187 So, if I just switch the pistons out on an EJ251 I'm good-to-go?
@@stephenhunt6253 yeah id say so.
the ej253 had dome tops to up the compression and the heads went along with the pistons. ej251 has flat top with valve reliefs and a smaller combustion chamber head to go with the pistons.
One thing I understand is that forged pistons are preferable when making power because they are stronger.
But I don't really understand why? Are we saying that in the tune with forged pistons we are allowing the engine to detonate where we wouldn't for a cast piston?
think of it like this, a forged piston isnt melted down and poured into a casting like cast pistons, its literally a lump of metal cut into shape of a piston, its alot stronger than cast thats for sure
cast pistons for Subies have a higher silicon content than most, strong but brittle. They act more like glass than metal after excessive detonation.
Also, keep in mind the cast pistons of the 02-05 USDM EJ205 engines are less prone to ring land failure that the hypereutectic pistons in the Ej255s in later years. If you aren’t going silly with mods then the OEM non- hypereutectic pistons work great. I just pulled mine out of my 02 bugeye wagon EJ205 with 170k miles and there was still the black mirroring on the skirts; thin in spots but still present.
On NA models, which is more reliable if both were in perfect condition ej22 or ej25
ej22, less likely to blow a head gasket. I drove my legacy outback for over 300,000 miles with the ej22 with no head gasket or other engine issues.
What's the difference between all arp headstuds thickness, any advantages?
the shaft dia varies with brand as well as small things like the allen key socket
is the ej257 still a good block would you still recomend it?
it totally depends on what you're trying to achieve. There's nothing fundamentally wrong with an EJ257.
well a daly driver/week end auto cross
For autocross it's very interesting because you can produce more low end torque than on a ej207. For daily use, the only downside is that it can be a bit more thirsty on fuel.
well i am worred about the liner craking under high boost pressure
sleeve it then
If Subaru would make their engines closed deck to start with they wouldn't have the head gasket issues they have. I would think it would be cheaper in the long run versus warranty repairs and their reputation would be improved. My ej22t has over 300 thousand miles and no head gasket issue. Closed decks are the cats meow.
any one know of duel avcs jdm ej20x turbo semiclosed dech
mariopic in terms of the bare block, I’d say it’s probably exactly the same as the EJ20 shown in the video here.
All EJs were semi-closed deck engines, and the AVCS would only affect the heads.
Is my ej208 engine good
Second.
FIRST
Can you advise if the different ej25 engines are directly interchangeable without modification to the vehicle. I have a 2008 liberty 2.5lt non turbo
Can a EJ25 single Cam engine be exchanged for a EJ25 dual Cam? On a 1999 Forester. Thanks