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Old 03-17-2013, 09:02 AM   #226
jnorth85
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Any D25 head pics??
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Old 03-17-2013, 10:09 AM   #227
FuJi K
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Quote:
Originally Posted by jnorth85
Any D25 head pics??
What would you like to see? I've got a pair of '06 & '07, which has slight differences but the ports are the same in and out.
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Old 03-17-2013, 10:20 AM   #228
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Quote:
Originally Posted by FuJi K View Post

What would you like to see? I've got a pair of '06 & '07, which has slight differences but the ports are the same in and out.
How are the port sizes in comparison to B25 heads?
I've heard they are great on E85 cars due to the hemispherical combustion chambers.
A pic side by side a B25 would be cool to see!
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Old 03-17-2013, 11:52 AM   #229
FuJi K
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Quote:
Originally Posted by jnorth85

How are the port sizes in comparison to B25 heads?
I've heard they are great on E85 cars due to the hemispherical combustion chambers.
A pic side by side a B25 would be cool to see!
The exhaust ports are the biggest difference. You could find that info in my DD thread. Secrets in there
http://forums.nasioc.com/forums/show....php?t=1728481


This post got secrets!
http://forums.nasioc.com/forums/show...&postcount=190

D25 with some work


WRX S20 with flared sides



WRX heads modded to replicate B25 chambers

Last edited by FuJi K; 03-17-2013 at 11:57 AM.
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Old 03-25-2013, 08:47 PM   #230
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Quote:
Originally Posted by FuJi K View Post
JDM STi Version 6 head port gallery


Hey Fuji... Great thread bro!
If anyone here knows the answer to my question, it would have to be you.
Can you please tell me if there is any difference between reg Ver6 STi heads, and Ver6 sti RA heads? Or even one further, what about the Ver6 STi RA WRC limited heads? I've heard they were big port, and the cams were 264IN/EX. Any truth in this? I appreciate any info that you can provide!
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Old 03-25-2013, 09:13 PM   #231
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Quote:
Originally Posted by Scoobie Steve View Post
Its not hard to believe NA heads flowing well. It is hard to believe they flow better then Spec C. I am not questioning the fact that DOHC 2.5 head are very similar to early JDM heads. They are not like Ver 6 RA heads or Spec C heads.


What we need are flow numbers from a NA DOHC head (which i have never seen) and flow numbers of a Spec C head on the same bench pulling the same Inches of water. You can not compare 25" and 28", there is a formula to convert them but i dont know how.
Hey Steve, it seems like you know a fare share about the differences in all these heads. Are the ver6 sti RA/R & RA/R WRC heads different from the reg Ver6 STi heads?
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Old 03-25-2013, 11:15 PM   #232
FuJi K
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Quote:
Originally Posted by WelDun1

Hey Fuji... Great thread bro!
If anyone here knows the answer to my question, it would have to be you.
Can you please tell me if there is any difference between reg Ver6 STi heads, and Ver6 sti RA heads? Or even one further, what about the Ver6 STi RA WRC limited heads? I've heard they were big port, and the cams were 264IN/EX. Any truth in this? I appreciate any info that you can provide!
Seeing a ver6 STi head, Ver7 specC, and ver9, there where no differences in head port size aside from AVCS on the ver7+. The intake ports are not gasket matched like our B25/D25/W25 heads.

I can't say about the cams.

Looking for help on an engine setup?
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Old 03-25-2013, 11:37 PM   #233
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Quote:
Originally Posted by FuJi K View Post

Seeing a ver6 STi head, Ver7 specC, and ver9, there where no differences in head port size aside from AVCS on the ver7+. The intake ports are not gasket matched like our B25/D25/W25 heads.

I can't say about the cams.

Looking for help on an engine setup?
I just bought a Ver6 STi RA limited clip. Haven't actually got it yet, but I was just wondering because I have been debating this topic with a buddy. I've had a few ppl tell me that the Ver6 STi RA heads are different than the reg STi heads. That they have bigger ports, and the cams are more aggressive. I don't want to tell anyone this until I know for sure. Im not the type to talk about things I don't know.. lol
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Old 03-25-2013, 11:43 PM   #234
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Quote:
Originally Posted by FuJi K View Post

Seeing a ver6 STi head, Ver7 specC, and ver9, there where no differences in head port size aside from AVCS on the ver7+. The intake ports are not gasket matched like our B25/D25/W25 heads.

I can't say about the cams.

Looking for help on an engine setup?
I also noticed that Scooby Steve mentioned a few times in this thread that such n such heads are nowhere near the Spec-C & STi RA heads, and had me thinking why he didn't just say that the Ver6 STi heads in general, are better.
I'm just curious, that's all. Not trying to be right or anything, its all for the sake of knowledge. I'm impressed with this thread that you put 2gthr. You definitely know a lot about different heads. Lol
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Old 03-26-2013, 12:15 AM   #235
FuJi K
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If you want to take pictures of your heads when they come in and also measure them, go for it. I can send you a bottle cap if you want to test!

We have a pair of Ver8 and ver9 heads that i can take a few photos of if you want a comparison.
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Old 03-26-2013, 12:38 AM   #236
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Quote:
Originally Posted by FuJi K View Post
If you want to take pictures of your heads when they come in and also measure them, go for it. I can send you a bottle cap if you want to test!

We have a pair of Ver8 and ver9 heads that i can take a few photos of if you want a comparison.
Now I feel stupid. What does a Bottle cap have to do with measuring the ports? Haha
And I just wanted to compare the Ver6 STi heads with the Ver6 STi RA & RA WRC.
My whole argument was based on the theory of, why wouldn't they make the RA WRC heads a little better. IMO, cosmetic differences like blue trim & seats, no PW/AC, aren't very significant for "Race Altered". You would think they did some kind of performance upgrade, & not just shed a few lbs, add dccd & call it a day.

But I guess while I'm at it, it wouldn't hurt to compare with the V7/8/9 as well.
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Old 03-27-2013, 03:08 AM   #237
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I saw your video on the Ver6 heads, and now I know about the pop bottle cap.!

I think I've learned more than I thought I would on different heads in the past fee.days than I thought was possible.

Side note... I have some 2.2l dual port heads for sale from the 95 Impreza I just bought for my swap.
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Old 03-27-2013, 03:09 AM   #238
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Hey Fuji,
The video you have on PnP the heads is pretty good. I've done it one time.and felt pretty good about it. Never had them flow.tested tho. I'm getting pretty good at PnP the intake Mani as well. What are you currently running? And from your experience with JDM Ver6 STi ej207, what do you suggest I go with when it comes to internals? I was thinking a Wiseco/Manley combo, and if I can afford to do any head work, I was looking at the Brian Crower stage 2 cams. I really like the JUN 272's, but they are a bit spendy. Also, do you think its possible to get close to 400bhp with the stock vf29? If not I want to get a vf36.
Thanx for your info and help!
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Old 03-31-2013, 01:05 PM   #239
FuJi K
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My current setup is a '06 WRX TR swap in my '99 Impreza wagon. I have to put together an engine so i can get it running; '99 ej22e, cp pistons, eagle rods. Also slap together a set of heads from what i have; '06 WRX AVCS. Run this in the car with my TD04L on stock exhaust manifold. Gas mileage is going to suck with my JDM 6spd. Instant boost!

VF29... It will not make the power you seek. If that power level is what you're looking at, forged pistons is really all you need

Last edited by FuJi K; 03-31-2013 at 01:12 PM.
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Old 05-11-2013, 10:21 PM   #240
FuJi K
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'10 Legacy GT E25. Nothing new


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Old 08-16-2013, 08:17 AM   #241
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Thought I'd post some pics of my version 10 JDM GRB EJ207 Spec C W20 heads

These are dual avcs, shim under bucket, with 9.4mm lift inlet cams and 10.5mm lift exhaust cams. Factory spec C grb






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Old 08-16-2013, 09:05 AM   #242
Patrick Olsen
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Were they blurry like that from the factory, or did you get them custom blurred?
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Old 08-16-2013, 04:31 PM   #243
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Those are as they left the factory


However, after tracing the origins of this motor, I am led to believe it was a hand assembled r205 long block that was used in the r205 test mule.

This may have received some additional attention but I doubt it - Ports don't look deburred at all.

Mick
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Old 08-17-2013, 03:09 AM   #244
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Quote:
Originally Posted by dr20t View Post
Thought I'd post some pics of my version 10 JDM GRB EJ207 Spec C W20 heads

These are dual avcs, shim under bucket, with 9.4mm lift inlet cams and 10.5mm lift exhaust cams. Factory spec C grb
Nice!!! Any idea what the Duration is? They have pretty high lift for stock cams, pretty damn aggressive i bet too!
Im wondering since its a Spec C, if its a low duration.
The Kelford's that I just bought for my Ver5 RA are a Low duration High lift @ 264/260 10.9/10.45 LSA 110/110 and the Kelford rep said that they're made for Rally/Time Attack
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Old 08-18-2013, 08:21 PM   #245
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I'm advised they're 254 inlet and 264 exhaust

So not massive duration

Mick
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Old 08-19-2013, 01:15 PM   #246
charliew
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Still enjoy this thread. One day someone will flow on the same bench on the same day all the bigger port heads with the same size big valves at .430 lift for the turbo motors and the truth will be known. Course na heads will need a lot of different characteristics to get down low torque. Smaller better shaped ports and bowls etc. I have yet to see ported heads perform better down low than stock.

Last edited by charliew; 08-19-2013 at 01:21 PM.
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Old 02-26-2014, 10:39 PM   #247
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anyone have any port size comparison data on the w20 vs w25 heads?
could these be "big port" heads for the usdm gr people with quad avcs?
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Old 05-29-2014, 11:54 PM   #248
FuJi K
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Quote:
Originally Posted by williamwarn View Post
anyone have any port size comparison data on the w20 vs w25 heads?
could these be "big port" heads for the usdm gr people with quad avcs?
W20 are a newer big port version. From what I've seen there's a slight change in shape. Still larger than w25
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