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Old 03-14-2019, 11:40 AM   #1
sh4d0w
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Member#: 443099
Join Date: Mar 2016
Location: Montreal
Vehicle:
2001 RS
black

Default Need advice 96 Version 4 EJ20 Heads

Hey guys I have just torn down my block as it was starting to knock on one of the rods I think it will be inspected today. Regardless I need to rebuild or swap it.

I am gathering different options on how to build this thing and I have some questions.

So my goals are around 500 awhp here are my mods...
GTX3582r
850 cc side feed injectors
Headers
PCLink G4 ECU
Walbro 250 pump
Aquamist HFS3 Meth 50/50
I was at around 375 - 400 whp before.

So here is my problem I have heads with hydraulic lifters in them which I think are plain version 4 wrx heads. If anyone can help with identifying them if would be great. (I'll post pics)

My main question is: Are these worth getting ported and polished? What are my options if I want to change the heads.

I also contacted Kelford cams cause I want to put cams in it and they say they don't make cams for the version 4 head wtf? Who makes cams that work in my heads?


I was thinking of getting a stroker setup... stock 2.5 balanced crank, JE Pistons, Manley I Beam Turbo Tuff Rods.

But if my heads aren't worth rebuilding then I am thinking of just picking up a IAG short block and buy used 2.5 liter heads and building one of those instead.

Does anyone have any recommendations on what I should do. This is driving me nuts.

Since I've owned the car the redline has always been set to 8k RPM people are telling me the hydraulic lifters are bad for high RPM applications. Is this true?

Thanks in advance for any help guys.
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Old 03-14-2019, 11:47 AM   #2
sh4d0w
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https://imgur.com/a/7txXojj

Here are some pics if you need better ones let me know.
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Old 03-14-2019, 02:51 PM   #3
Bansheeboy11
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Chapter/Region: Tri-State
Location: New York
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1999 RS
Aspen White

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I 110% recommend switching to shimless buckets, theyre not cheap if you buy new but broken shims sink ships. They may be big-port phase one heads as well but you didnt include a intake port pic, but those heads will be fine for your motor. I would contact and use UK based companies like Roger Clark and Scooby Clinic as they've had those motors for the better part of 30 years.

I correct my statement, the conversion from the hydraulic bucket style to a shimless bucket might not be possible if those are WRX hydraulic bucket heads. I dont play with these old heads much..

Last edited by Bansheeboy11; 03-14-2019 at 03:42 PM.
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Old 03-14-2019, 03:16 PM   #4
sh4d0w
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Hey thank you so much for the reply I just got off the phone with brian crower cams and they said they did not make cams for these heads either. So either I am giving them the wrong info or I am really screwed.

So bansheeboy you are saying that I can just change the buckets basically?
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Old 03-14-2019, 03:24 PM   #5
sh4d0w
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I added pics of the intake ports as well.
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Old 03-14-2019, 03:37 PM   #6
Bansheeboy11
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I correct my statement, the conversion from the hydraulic bucket style to a shimless bucket might not be possible if those are WRX hydraulic bucket heads. I dont play with these old heads much.. Contact Roger Clark they will help you out

Heres some threads regarding your heads

https://forums.nasioc.com/forums/sho....php?t=1528693

https://forums.nasioc.com/forums/sho....php?t=1910011

Last edited by Bansheeboy11; 03-14-2019 at 03:44 PM.
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Old 03-15-2019, 03:51 PM   #7
sh4d0w
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So I spoke to Mike from RCM and he says these are version 1/2 wrx heads. So I can use version 3/4 sti heads but those still are not the solid lifter type. I would then have to get the new heads machined to accept the larger buckets. This is tons of $$ so for now I am going to run my wrx heads until i can find some decent used version 3/4 sti heads and slowly build them. Thanks bansheeboy Mike from RCM was super helpful.
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Old 03-21-2019, 11:46 PM   #8
binny
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Quote:
Originally Posted by sh4d0w View Post
So I spoke to Mike from RCM and he says these are version 1/2 wrx heads. So I can use version 3/4 sti heads but those still are not the solid lifter type. I would then have to get the new heads machined to accept the larger buckets. This is tons of $$ so for now I am going to run my wrx heads until i can find some decent used version 3/4 sti heads and slowly build them. Thanks bansheeboy Mike from RCM was super helpful.
You can use EG33 exhaust buckets (shimless) I didn't think any WRX heads had hydraulic buckets ? Have you taken them out and checked?
The RCM V 1 - 4 cams would likely be able to be used
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Old 03-22-2019, 03:37 PM   #9
ripman
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Also check out Tighe Cams in Australia.

Kelford used to make the ones you are after. You would only have to order a set they'd still have the technology
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Old 03-22-2019, 05:45 PM   #10
vica153
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Most people limit HLA buckets to ~7k. I limited mine to 6500 when I did a build with those heads. I was running a vf39, so I didn't have much reason to push higher rpm. I do like the idea of the HLA buckets, but they are going to hurt performance above 6k.

Switching to a set of newer heads single or dual AVCS is a better plan. You'd have to put a bunch of cash into those old heads just to get them to perform on the level of stock AVCS heads. Even then the AVCS heads are going to have a broader powerband.
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Old 03-30-2019, 06:59 PM   #11
sh4d0w
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ok so i took everything apart and measured it all.
the springs are 40.2 mm in length
the exhaust valve is 94.1 mm and has a e253 stamp on it
the intake valve is 93.4 and has a i252 stamp on it
I've looked into picking up rcm cams but i don't think they will work.
I would have to change springs and the only springs they sell on RCM have a 54mm length.
So i don't think the cams will work.
I think I really need to just pick up some 3/4 heads. anybody that can source these please let me know.
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Old 04-16-2019, 01:39 AM   #12
binny
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Check with some Aussie shops perfourmance Motorsport do a heap of 20K heads
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