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Old 09-18-2003, 12:41 PM   #1
sponaugle
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Default Call for Info on JDM STI Heads..

Over the past year, I have been collecting information abougt the different JDM STI and WRX motors, and what the heads and blocks are.

I'm hoping that all of the other STI guys can jump in with everything they have. Ron, Nathan, Clark, etc!

This all started with my first STI engine purchase, followed by 3 more purchases for guys here in our club, and a few more after that. Each one was a bit different, and I started to collect everything that I could find.

First, there are the little white stickers that help to identify what engine is what. Here is a quick rundown of what I know so far.

The short version is this.

Engine code is EJ20xyyzqq,
where x is 5 or 7 (for 205 or 207)
where yy is dw for JDM market, nw for export market (nz,aus)
where z is model year. 3=01, 4=02, 5=03
where qq is model type. BE=wrx,CR=STI, EJ=RA Spec C.

Long version of the table at the end of this message.

On to the important stuff

I have received conflilicting reports about the difference between the MY02 STI and STI RA heads. I have seen several different engines of each type, none of which is conclusive. Here is what I have observed.

First STI engine I got was a NW4CR. This was a MY02 STI export (NZ), and it had the regular EJ207 block, and AVCS heads. Apon closer inspection, it was obvious that these heads were the same size/cast as the US WRX heads, with AVCS added. (You can add AVCS to the WRX heads pretty eaisly). These were not big ports at all. Identical to the US WRX. I talked to Dave at Rallispec about this, and he commented a couple of options. Either they export them this way, or this was an early export and they changed to something else later. Either way, this would be treated as a JDM STI motor by most people, and the heads were not nearly as big as the others to come.

Next engine was real JDM STI, confirmed by the numbers. These head ports were much larger, and the head casting number (which you can read on the top of the heads when they are installed) were LHSsomething, and RHSsomething. More on this later.

At this point, I assumed that the real JDM STI Heads were the good ones, and the JDM guys just stuck it to the export STI guys.

Next engine was a real STI RA Spec C, confirmed by both the Cams, as well as the little white stickers. This head looked exactly the same as the other JDM STI. Same big ports, same casting numbers. (well sortof.. Left was the same, right was different).

Next engine after that was another STI RA Spec C (JohnH's car). Sticker verified it was a My02 Spec C, and the head numbers were also the same.

Next after that was Adam Koppels STI MY02 (with white sticker). Those heads looked almost the same as well. I didn;t get a chance to measure the cams, but the casting and numbers were the same as far as I could tell.

I also talked about this a bit to Dave at Ralliispec, and I remember him suggesting that there may have been a changeover in the heads sometime in the MY. In other words, the very first JDM STIs my have had the smaller heads (like the export motor I have), and then switched to the larger heads later.

One other point. According to the parts catalog, the cams for MY02 are two different types. One set for all of the STIs, and One set for the STI RA Spec C and STI Limited. From that same catalog, I hear that the MY03 cars all have the same part number CAM, and that it matches the previous year Spec C. This implies that all JDM STI V8 motors, Spec C or not, use the same cam (and a good one). No way to confirm this, but Ron's observations seem to differ. Ron has seen a MY03 head, so he can comment on that and provide the casting numbers for those.

IF I COULD ONLY GET AHOLD OF A JDM PARTS CATALOG. $$$

So, here is what we need to do:

Ron: First, any idea on the lobe height on those weird MY03 Spec C cams? That might be a good place to start. Perhaps I can make a comparison to the older Spec C cam I have and we can see the difference.

Second, can everyone with a JDM STI motor do the follows:

First , see if you can find the 'little white sticker'. It is on the back bottom side of the drivers side head. It has a number on it, something like EJ207Dw3EJ.

Second, get the head casting numbers off the two heads. They are easy to see, as they are on the top of the head when insalled in the car, right under the fuel injectors. It looks something like 'LHS205' or so.

I'll get a picture posted here to start us out. Also, I will check my car and other engines over lunch.

Clark can also provide some input. I have not personally seen a JDM WRX engine, so I can't comment on those heads. I was suprised to see that the US WRX heads are fully AVCS ready with only one small change. The US WRX head casting was made for AVCS, and they even drilled and tapped the bolt hole to old the AVCS cam sensors. Intersting stuff!




Code:
A (MY01 - New Age Body Style Rev 1, V7 )
00/08-01/08

WRX NB (5mt)      GDAA4CD - EJ205DW3BE
WRX NB (4et)      GDAA4CT - EJ205DW3BE
WRX Sti           GDBA4EH - EJ207DW3CR 
WRX RA-Sti        GDBA4DH - EJ207DW3CJ
20K (wagon 5mt)   GGAA58D - EJ205DW3BE
20K (wagon 4et)   GGAA58T - EJ205DX3BE
Sti (wagon)       GGBA5EH - EJ207DW3CR 

B (MY02 - New Age Body Style Rev 1, V7)
01/09-02/10

WRX NB (5mt)      GDAB4CD - EJ205DW4BE
WRX NB (4et)      GDAB4CT - EJ205DW4BE
WRX NB-R          GDAB4HT - ??????????
WRX Sti           GDBB4EH - EJ207DW4CR
WRX STi-RA spec C GDBB4FH - EJ207DW4EJ
WRX STi PRODRIVE  GDBB4KH - ??????????
WRX STi LIMITED   GDBB4JH - ??????????
S202 STi version  GDBB4FH - EJ207DW4ER
20K (wagon 5mt)   GGAB58D - EJ205DW4BE
20K (wagon 4et)   GGAB58T - EJ205DX4BE
Sti (wagon)       GGBB5EH - EJ207DW4CR

C (MY03 - New Body Style Rev 2, V8)
02/11- 

WRX (5mt)          GDAC48D - 
WRX (4et)          GDAC48T - 
WRX Sti            GDBC4EH - 
WRX STi spec C     GDBC4FH - EJ207DW5EJ
WRX Wagon (5mt)    GGAC58D - 
WRX Wagon (4et)    GGAC58T -
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Old 09-18-2003, 01:05 PM   #2
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http://forums.nasioc.com/forums/show...hreadid=371416

That is the old thread where Clark makes most of his observations and comments.
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Old 09-18-2003, 01:30 PM   #3
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Here is what I know:

My motor is a JDM 02 or 03 model Type RA, Spec C or STI Limited Engine. My white sticker was gone so I am out of luck on that one. I recorded all of the numbers off the engine and submited them to several sources and I was told by two that I had an RA or limited engine.

All Type RA engines have Smooth bore manifold risers. STI's have the splitter and US cars have the TGV housings with splitter.

Real Type RA engines used the V7 STI head castings(sorta) with larger intake ports. The ports have a smooth look to them and the port splitter is recessed in the head. They almost look hand ported. STI engines do not have this port work. They have a rough casting but still have the larger ports.

Here is a picture of a US EJ205 Cyl head with the old Marking of RHS20 meaning Right hand side 2.0 ltr. This is the V6 STI head casting and you are correct in that it will take AVCS. Notice the split port and the distance from splitter to deck.





Here are the big boys. The stuff of dreams (ha!). The real deal Type RA head. Its based on a V7 STI head but you can clearly see in this picture the smooth ports. Notice how deep the splitter is in the head. Notice the marking of "RHC. For Right hand Cyl. Thats right.. Its a different casting to begin with. This is NOT a V7 STI head with some work done to it. V7 STI heads would say "RHS20V" on them. right hand side 2.0 ltr roman numural V. Why did they recast the head? I have to suggest they changed it to fix and water cooling issue but its pure speculation.




So:


V7 JDM WRX AND STI should have "LHS20V" and "RHS20V" on the Cyl heads. STI and WRX heads are the same except for the valve size and cams. Casting wise they are the same. As Ron pointed out the best bang for the buck is the JDM WRX motor. I have seen one first hand and can tell you that they do in fact have the V7 heads, better cams and higher compression. I kick myself because Ron used to blow these motors out for a SONG! I should have purchased ALL of them. I could then mate these to US 2.5 shortblocks and have a killer 2.5ltr big port motor to sell cheap.

V7 Type RA, Spec C, STI limited should have "LHS20V" and "RHC" on the right cyl head. If so then you have the real deal.

V6 STI heads are the same as the US WRX heads in casting. US has no AVCS and JDM Does (some of them). These heads will say "RHS20" and "LHS20".


Now... One thing must be made clear... Subaru has done some odd stuff when demand was high. I have been told over and over by different people that the first WRX's had weak 5mt's and to combat that Subaru installed the replacement stock of STI V6 5mt's until the gear sets could be fixed. Early cars broke transmissions with VF22's. My car is sustaining 450+ ft lbs of trq and just nicely with over 100 drag passes.. Maybe I have a strong trans? Its just one example of how Subaru is flat out famous for doing what it takes to get the cars to market.


HTH

Clark
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Old 09-18-2003, 01:45 PM   #4
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Quote:
Originally posted by AZScoobie
... Its just one example of how Subaru is flat out famous for doing what it takes to get the cars to market.
as always, thanks for the great info, clark.

i wonder, with respect to the above remark, if there's ANY way to get answers out of FHI in japan? like jeff even pointed out, at this point even a parts catalog would be helpful!

there have to be some folks out there that know this information, and right from the source. it would be so nice to find someone who was willing to relay things straight from the horse's mouth, so to speak.

the route the information takes seems soooooo convoluted... we need a "deep throat" on the inside!

ken
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Old 09-18-2003, 01:58 PM   #5
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Quote:
Originally posted by dwx
http://forums.nasioc.com/forums/show...hreadid=371416

That is the old thread where Clark makes most of his observations and comments.
Yea, I saw that thread as well

From that thread here is some of the data:

Positive identification:
US WRX Heads: LHS20, RHS20
MY02 JDM STI RA Spec C Heads: RHC and LHS20V (from clark)

Unsure identification:
Proposed MY02 JDM STI Heads: RHS20V, LHS20V.
Proposed MY02 JDM STI RA Spec C Heads: RHS20V, LHS20V.

Also here are some of what I have seen:

Adam Koppels car has positive identification as a MY01 JDM STI engine (built october I think), and his heads say RHS20V and LHS20V. Ports look big and ported just like the RAs are supposed to be. Don't have cam measurements on this motor..

Will get more measurements and picures soon..

Last edited by sponaugle; 09-18-2003 at 09:22 PM.
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Old 09-18-2003, 02:05 PM   #6
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Quote:
Originally posted by sponaugle

Yea, I saw that thread as well

From that thread here is some of the data:

Positive identification:
US WRX Heads: LHS20, RHS20
MY02 JDM STI RA Spec C Heads: LHC and RHC

Unsure identification:
Proposed MY02 JDM STI Heads: RHS20V, LHS20V.


Also here are some of what I have seen:

Adam Koppels car has positive identification as a MY01 JDM STI engine (built october I think), and his heads say RHS20V and LHS20V. Ports look big and ported just like the RAs are supposed to be. Don't have cam measurements on this motor..

Will get more measurements and picures soon..


Except that Type RA engines say RHC and LHS20V. ....


Clark
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Old 09-18-2003, 04:30 PM   #7
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I'll check mine tonight, and provide the info tomorrow.

Steve
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Old 09-18-2003, 06:19 PM   #8
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I have posted this before but thought I would add it here too.
Engine block white sticker ID ~ EJ207DW4EJ
Cylinder head casting #'s LHS20V 006 / RHS20V 006
My motor came with AC. I removed the intake manifold and it has the same port configuration and relative size as other spec C's I have seen. The lower intake manifold is completely open, no air splitter as found in the reg sti's. I have not measured cam specs. I must have an RA limited motor but I do not have the RHC stamping on the right side cylinder head.

Tom
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Old 09-18-2003, 07:16 PM   #9
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Quote:
Originally posted by AZScoobie


Except that Type RA engines say RHC and LHS20V. ....
Clark

It appears that the RHC doesn't directly relate to the RAness. I have an RA motor, with the original white stick (EJ207DW4EJ) on the heads, and both heads are LHS20V and RHS20V. Cams measure as RA as well.

John Halland also has a Spec C motor, and he has the same head markings.

I think this is a bondongle.. meaning that we can't rely on this alone. I have seen regular STI motors with the same casting numbers as confirmed STI RA Spec C motors..

UNLESS: the DW4EJ code does not mean just RA, but RA or Limiited. I'll ask Dave at Rallispec.

The smartest thing said all day was by Clark, who commented that Subaru swaps parts to meet demand. In other words, it is hard to know what you are getting. However, I can attest to the following:

The LHS20V/RHS20V heads are the larger port heads (compared to the WRX at least), and it appears that these heads can have either CAM/valvetrain set. You cannot know for sure until you take it apart, of find the magic white sticker.

I'll post a few pictures shortly of my RA block as well as everything else I can get my camara pointed at!

Jeff

Last edited by sponaugle; 09-18-2003 at 09:39 PM.
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Old 09-18-2003, 09:16 PM   #10
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Ok.. I emailed Dave at Rallispec, so he might be able to shed some light. Here is another quick look...

WRX heads, picture from Clark (Head reads LHS20/RHS20)


JDM STI RA Spec C heads, picture from Clark (Head reads LHC/RHC)


My STI RA Heads (Head reads LHS20V/RHS20V)


These last heads look to have the same size ports, but it is hard to tell if it is as smooth.. Clark can probably comment.

It is interesting that some of the RA motors have LHS20V on one side, and RHC on the other. I wonder if as Clark speculated if there was a demand problem and they had two different castings to swap between?

Did anyone find out what the casting stamps are on the new V8 heads? How about the US STI heads?

Jeff
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Old 09-18-2003, 10:03 PM   #11
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Quote:
Originally posted by AZScoobie
Here is what I know:
V7 Type RA, Spec C, STI limited should have "LHS20V" and "RHC" on the right cyl head. If so then you have the real deal.
Clark
There weirdest thing of all is the idea that Spec C motors have one head that is the same as the regular STI (the LHS20V), but that the other side is a RHC. Perhaps Clark is onto something in suggesting there was a small "correction" by Subaru.. Perhaps a change in the coolent passages or such that warrented a new casting for the newest RAs? Does anyone know if the MY03 heads (V8) are also RHCs or LHCs?

Jeff
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Old 09-18-2003, 10:20 PM   #12
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My 02 v7 STi engine has LHS20V on the left and RHS on the right cylinder heads. I am @ work right now, but I'll have more information tomorrow.

Great pics

Steve
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Old 09-18-2003, 10:39 PM   #13
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I know Ron@Axis has a few sets of V8 RA heads and had a complete V8 twin-scroll engine not too long ago. The heads he is building for me are V8 RA heads as well so he should be able to easily look at the stampings on them. Hopefully he finds his way over to this thread.
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Old 09-18-2003, 11:58 PM   #14
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We should try to figure this one out. Its clear that the RHS20V and LHS20V heads are the new STi heads (V7). I am really starting to wonder what the "RHS" head is and why its on the motor. It makes me feel much better that Steve has the RHS as well because I was starting to wonder if I had one RA head and one ????(God I hope its not a forester head on the right side)

I had my shortblock sitting in the garage for a week with no manifold and I know that my ports are the same left to right. It looked like this motor has never been apart. I purchased it from Ron at Axis. We will probably find out that there was some issue with the Right side and the cyl head was changed. Or, RHS is maybe the WRX JDM head or forester head and Subaru just used those castings for the right side.. Eitherway I dont think it makes much difference if they are the same casting ect...

Interesting info... Lets try to track down the RHS thing...


Clark
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Old 09-19-2003, 01:04 AM   #15
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I will check the vers8 stuff tomorrow and if I find my camera take some pics of the ports and numbers.

I do know there are two versions of jdm ej205 motors. There is the actual wrx engine, then the other vers that ends up in legacys and foresters. The wrx engine gets the better heads.

I haven't had to swap heads on any motor I have received yet. I have had to change pulleys and such, but never the entire head. When the pulleys are damaged, I always take out the cams and check them for straightness and make sure there's no damage. I sent out a vers8 motor to AVsport last spring and they said it had a damaged cam. I didn't see it, but whatever. If the heads or cams are damaged, I take the engine apart and strip it.

Here is a little fun note about the vers8 heads I have. The entire outer rim of the intake port is machined down a bit. Looks like when you cut a valve seat, there's about a 45deg angle to it. I will try to get some good pics of this.

Also, I have some 2000 spec WRC heads and cams, but those are my babies. I am keeping those to myself. I worked a deal with a guy in New Zealand for them and I had them checked out in Japan by someone who knows, and they are for real. Maybe when I get them on my 2.2, I will share a little info on them.

Ron
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Old 09-19-2003, 04:40 AM   #16
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I have a Eurospec MY03 STi engine here. (it is 100% the same as the Eurospec MY02 engine) It has the small LHS20 and RHS20 heads and if I look at the lift it seems to have the same cams as the "normal" JDM STi. No splitter in the manifold risers. The sticker shows: EJ207NW5CR

Mark.
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Old 09-19-2003, 07:10 AM   #17
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LOL All I know about this years JDM STI motor is it has a semi closed deck!!!
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Old 09-19-2003, 12:43 PM   #18
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newbie question, how much are the v7 heads and can u mate them to an ej20. to form somewhat of a ls vtec kinda thing

sorry for the honda thing
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Old 09-19-2003, 03:10 PM   #19
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Quote:
Originally posted by [W]Dark[R]BuDDha[X]
newbie question, how much are the v7 heads and can u mate them to an ej20. to form somewhat of a ls vtec kinda thing

sorry for the honda thing
yes... and do a seach its been covered. Also do a seach on AVCS.
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Old 09-19-2003, 03:20 PM   #20
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Thats what a V7 STi engine is, an EJ20 with V7 heads. The only difference in the block itself is the semi closed deck, and its not much of a difference.

Internally, you have forged rods, forged pistons, and a crank with better oiling.

Anyway, back on subject. I'm going to call Subaru of America on Monday (FHI and SOA are the same phone number, kinda interesting) and see if I can talk somebody into sending me a history of part numbers for this stuff. I'm SURE they have it available someplace.

The research and development number is listed here, but its also 2 years old... http://www.fhi.co.jp/english/corp/ne.../netw_001.html
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Old 09-19-2003, 03:51 PM   #21
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I'm trying my contact at SOA R&D. He has a JDM parts catalog, but I don't know if he'll send a copy to me...
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Old 09-20-2003, 02:43 AM   #22
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sorry to be a buggaboo, but how much are the sti heads with avcs... and does it just bolt right on... any drilling for oil lines? and what would the compression ratio come out to be
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Old 09-20-2003, 04:06 AM   #23
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Quote:
Originally posted by totoherbs



quote:
--------------------------------------------------------------------------------
Originally posted by [W]Dark[R]BuDDha[X]
newbie question, how much are the v7 heads and can u mate them to an ej20. to form somewhat of a ls vtec kinda thing

sorry for the honda thing
--------------------------------------------------------------------------------




yes... and do a seach its been covered. Also do a seach on AVCS.
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Old 09-20-2003, 01:08 PM   #24
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I also got my motor from Ron at AXIS. Here is a pic

Sorry I didn't take a picture of the right side.
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Old 09-20-2003, 03:24 PM   #25
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Quote:
Originally posted by fatray
I also got my motor from Ron at AXIS. Here is a pic

Sorry I didn't take a picture of the right side.
That is the right side head 'RHS'. Those ports are identical to mine. Thanks for posting the photo..
Tom
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