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Old 09-24-2011, 12:24 PM   #1
tenchu
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Default NON-STi head conversion?

I have a set of EJ20K non-sti heads that I would like to convert to the STi shim under bucket, is this a possibility? I plan on rebuilding the head completely anyways, so I figure may as well do it right the first time.
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Old 09-24-2011, 04:33 PM   #2
RexWagonWA
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Default Head conversion

Take a look at posts by FuJi K. He is the guy who knows the heads, especially older ones.

GLWYB
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Old 09-24-2011, 05:19 PM   #3
Cbgrandtheftauto
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yes. see my thread that is sticky'd up top.


Valves are going to be expensive so best is to have aftermarket set made, Springs are going to be expensive and you will play hell trying to find someone who has them so you will have them specially made. Shims, retainers, and buckets can be found on japanparts.com
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Old 09-24-2011, 08:00 PM   #4
tenchu
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Quote:
Originally Posted by Cbgrandtheftauto View Post
yes. see my thread that is sticky'd up top.


Valves are going to be expensive so best is to have aftermarket set made, Springs are going to be expensive and you will play hell trying to find someone who has them so you will have them specially made. Shims, retainers, and buckets can be found on japanparts.com
I was planning on going aftermarket anyways (was looking into RCM) just want to ditch shim over bucket
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Old 09-24-2011, 10:11 PM   #5
tenchu
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Quote:
Originally Posted by Cbgrandtheftauto
yes. see my thread that is sticky'd up top.

Valves are going to be expensive so best is to have aftermarket set made, Springs are going to be expensive and you will play hell trying to find someone who has them so you will have them specially made. Shims, retainers, and buckets can be found on japanparts.com
After re-reading this, are you saying custom springs and valves will be required? Like, I couldn't "just" buy a complete STi valve setup and swap it into my heads?
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Old 09-24-2011, 10:31 PM   #6
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Quote:
Originally Posted by tenchu View Post
After re-reading this, are you saying custom springs and valves will be required? Like, I couldn't "just" buy a complete STi valve setup and swap it into my heads?
You can but that will get expensive real quick. You may be lucky and find someone selling some trashed castings with good internals in the FS section.
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Old 09-25-2011, 03:25 AM   #7
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My advice would be to use off the shelf aftermarket performance springs and valves for a USDM EJ25D engine (Supertech makes them) and use EZ30R exhaust shimless buckets, all of which are available in the US.
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Old 09-25-2011, 03:29 AM   #8
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Oh and if you want original STI V3/4 valve springs, part number is 13217AA160 and cost 9.00 euro each incl. VAT in Europe. Spring retainers are 13209AA081 and cost 3.50 euro each but as the groove on the valve stem is lower on the STI springs you will get less tension when using these springs and retainers on aftermarket EJ25D valves.
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Old 09-25-2011, 09:04 AM   #9
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Thanks guys! So the only thing I'd have to source overseas is the intake buckets and shims?
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Old 09-27-2011, 08:21 AM   #10
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You can use the EZ30R (2005 and up) exhaust buckets on the EJ20K intake and exhaust valves. The EZ30R has different intake buckets for variable lift...
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Old 09-27-2011, 08:29 AM   #11
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Quote:
Originally Posted by Marnix View Post
You can use the EZ30R (2005 and up) exhaust buckets on the EJ20K intake and exhaust valves. The EZ30R has different intake buckets for variable lift...
Oooooh!
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Old 09-27-2011, 10:19 AM   #12
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Also note you will have to measure valve clearances before you can order the EZ30R buckets as they come in different sizes.
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Old 09-27-2011, 01:01 PM   #13
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Quote:
Originally Posted by Marnix
Also note you will have to measure valve clearances before you can order the EZ30R buckets as they come in different sizes.
This much I assumed, gotta have SOME way to adjust clearance, and if there's no shims, then...

Thanks
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Old 09-27-2011, 01:32 PM   #14
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And I'd go with EJ25d retainers to match the valves, no?
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Old 09-27-2011, 05:02 PM   #15
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Quote:
Originally Posted by Marnix View Post
You can use the EZ30R (2005 and up) exhaust buckets on the EJ20K intake and exhaust valves. The EZ30R has different intake buckets for variable lift...
this is good to know.....
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Old 09-28-2011, 03:12 AM   #16
Marnix
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I plan on doing the same conversion myself, this is what I plan to use:

- MY97-98 EJ20G heads
- Supertech EJ25D valves
- Ferrea dual valve springs and retainers
- EZ30R shimless buckets
- STI V3/4 cams
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Old 09-28-2011, 08:50 AM   #17
tenchu
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Any particular reason you're choosing EJ20g heads?
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Old 09-28-2011, 12:27 PM   #18
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Quote:
Originally Posted by tenchu View Post
Any particular reason you're choosing EJ20g heads?
they are cheaper than WRX EJ20K heads? but they are the same casting just from a MY97/98 with a td04 (plain wrx wagon or forester)
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Old 09-29-2011, 08:12 AM   #19
tenchu
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Quote:
Originally Posted by elislider View Post
they are cheaper than WRX EJ20K heads? but they are the same casting just from a MY97/98 with a td04 (plain wrx wagon or forester)
So my WRX EJ20G heads should have the same flow as my WRX EJ20K heads?
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Old 09-29-2011, 09:49 AM   #20
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Yes indeed.
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Old 09-29-2011, 02:10 PM   #21
elislider
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well, if we are talking about v3-4 97/98 EJ20G heads. perhaps tenchu is talking about v1-2 93-96 EJ20G? do those flow the same as v3-4?
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Old 09-29-2011, 06:50 PM   #22
tenchu
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Quote:
Originally Posted by elislider View Post
well, if we are talking about v3-4 97/98 EJ20G heads. perhaps tenchu is talking about v1-2 93-96 EJ20G? do those flow the same as v3-4?
Yeah, I got v1/2 G heads, and v3-4 K heads
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Old 03-30-2013, 08:56 PM   #23
2slofouru
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Bumping this up to try and get my heads assembled.

I have ej20k heads with:

-supertech ej25d valves
-crower 0600 springs and retainers (02-07 wrx) as recommended by Joe from ASF
-? buckets

My heads were shim under bucket (sti?). The ej20k heads in my car are shim over bucket I also have the shims from a pair of ej25d heads and none of them are thin enough. I tried ordering a couple of usdm ej25 turbo thinner solid buckets to use as references to get the others measured but the diameters were larger (35mm) so no go. Does anyone know where the part numbers for these ez30r shimless exhaust buckets are, without having to painstackingly pry them from the dealers system?

I also measured my ej25d cams and the ej20k "sti" cams that came from the shim under bucket "sti" heads I'm building and.... they were the same lift. Is there a difference in duration?

Larger usdm ej255/257 new solid bucket (35mm O.D.) vs smaller ej20k/ej25d old shim over bucket (33mm O.D.)

And here is supertech's listing which states the ej25d non turbo is 35mm as well, apparently it isn't. http://www.nolimitmotorsport.com/sup...ps-Subaru.html



Last edited by 2slofouru; 03-30-2013 at 09:54 PM.
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Old 03-31-2013, 01:59 PM   #24
eg33GC
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Is the shim under/shim over rev issue even relevant anymore?
People are hitting the 8250 with shim overs that are convetionally no nos on here.

curious
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Old 03-31-2013, 02:58 PM   #25
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I'm not going to be running past 8k, but the solid bucket adds a little safety. The solids are also a bit lighter than the shim overs and that helps a little with efficiency/hp. My current ej20k spins to 7600 every now and then and has never had an issue with the shim overs coming off. On the engine I'm building I'd like to step the performance and safety up if possible though.
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