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View Full Version : Head info needed,2.5 2003-2004 JDM DOHC w/AVCS


PoZeR
05-31-2010, 08:13 PM
Hello all as you can see I’m a noob with a question.

I’m wondering if anyone happens to have a flow chart or knows the CFM of theses heads.
I have very little info on the head other than they are from 2003–2004 JDM Legacy with 2.5L NA and AVCS. The ports look huge compared to my 06 FXT head.

.
http://fast16v.com/fxtbuild/3.jpg
http://fast16v.com/fxtbuild/4.jpg
Sarra
06-01-2010, 01:48 PM
Are those turbo heads? Oh, 2.5, I guess not.

No idea on flow numbers. I'd ask on NASIOC, there's a few gurus there that may very well know. You may also just go to a local machine shop and see if anyone local to you has a flow bench, and bench flow them.

Those look like bigport almost. Aweome find. Phase 2, also awesome. Have fun running those with anything other than a JDM ECU lol
PoZeR
06-01-2010, 10:28 PM
I will actually be running these on my stock 06 USDM ECU.
They have 07 Sti cams that have been modded to use the further back position of the sensor.

Thank you for the reply bro.
Link the pic from DS1 info on this mod.
http://www.ds1motorsports.com/images/Tomei/CamMod/poncammod1.jpg
Sarra
06-04-2010, 04:06 AM
Not sure how an STI cam will work in a NA motor. It's pretty cool that that cam option is available though. If I were building a custom, one off motor for a car, I'd probably go with those heads, aftermarket AVCS cams, and a 2.2 turbo block that's been worked over.

As for flow, the 2.5 NA DOHC heads were basically the same as some of the older STi DOHC heads, as far as flow goes. Think, close to corvette numbers. That's about all I can think of on those heads.
PoZeR
06-04-2010, 11:49 AM
I’m sorry I didn’t explain what I was using the head for I was just curious about head flow and figured this would be the place to ask.
I’m actually putting this on as built EJ255 with 8.1:1 Mahle pistons and Cosworth bearings. I’m sure this will bump compression up a bit but I’m compensating for this by tuning on e85.

For the moment I’m running a ported VF43 but plan on something to go better with this build later on when I can afford it.
The head was completely redone new valves, seals, buckets.


The reason for this is the timing belt tensioner in my 06 Forester broke causing some awesome damage to the head by snapping off a valve @ 6500rpms
http://fast16v.com/fxtbuild/1.jpg
http://fast16v.com/fxtbuild/5.jpg