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Old 03-04-2006, 03:52 AM   #1
shouldaboughtanSTI
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Member#: 100782
Join Date: Nov 2005
Default JDM Heads,or cmas,and goodies??

I have a version7 shorty..and am trying to work out a solution for the rest..If i buy the jdm heads..Then,thats it..I wont have the money for the wiring,ecu,etc,,So, No AVCS..for awhile..But, if i buy cams,springs,etc to put into my heads..Would that be close to as good as the v7-v8??Or,should i just get the jdm heads,and wait until i can get the rest,or just install them without it??Any help apreciated..Jason..
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Old 03-04-2006, 04:11 AM   #2
petawabit
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Member#: 18978
Join Date: May 2002
Chapter/Region: SCIC
Location: orange county, CA
Vehicle:
96 brighton
05 AP2 ,09 GE8

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buy my heads
I think you should break it down.

US heads:
better valvesprings and retainers
better cams(depending on which ones)
smaller intake and exhaust ports
smaller valves

Labor+cams+valvesprings and such:~1700 or so depending on labor, cams and valvesprings you get

JDM heads:
decent valvesprings and retainers
lesser cams
bigger intake and exhaust ports
bigger valves with the exhausts being lighter and having better heat dissipation(sodium filled)
avcs(which is pretty big)

labor+heads:~1900 or so

Also if you buy the JDM heads, you can sell your wrx heads for 500 or so. Not much value in wrx valvesprings/retainers and cams
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Old 03-04-2006, 12:26 PM   #3
PeteDucati
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Member#: 44629
Join Date: Oct 2003
Chapter/Region: Tri-State
Location: '04WRX-Axis ej257, IPT 4eat.
Vehicle:
CNC 'd heads, cams
DB18g/EWG - F/S $8K

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These cars suck. No one really knows if higher flowing heads are necessary with higher lift/more duration cams. You might be pissing into the wind by adding better cams to USDM heads without having them ported.. but I don't think anyone really knows - but everyone has an opinion and theory.

Ported WRX heads with cams+springs+retainers= ~$2500-3000
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Old 03-06-2006, 08:02 AM   #4
djviper
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Location: north london England
Vehicle:
99 V.R.Special
WRC blue

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id port before changing cams, as the cams will only work as well as the ports. IMO
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Old 03-07-2006, 06:16 AM   #5
PeteDucati
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Join Date: Oct 2003
Chapter/Region: Tri-State
Location: '04WRX-Axis ej257, IPT 4eat.
Vehicle:
CNC 'd heads, cams
DB18g/EWG - F/S $8K

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Quote:
Originally Posted by djviper
id port before changing cams, as the cams will only work as well as the ports. IMO
Where and who has done the proper testing to prove this. Most think the opposite is true.. that the stock cams are so damn mild they're the restriction, not the heads.
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Old 03-07-2006, 07:04 AM   #6
djviper
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Quote:
Originally Posted by PeteDucati
Where and who has done the proper testing to prove this. Most think the opposite is true.. that the stock cams are so damn mild they're the restriction, not the heads.
IMO = IN MY OPIONION

thing is there are that few differences between the two heads youd get a better result for the same money if you worked on the wrx/sti heads, i mean a quick look on uk e bay theres a us sti 8 head an cams for $1700!

ill be honest if it was my car i would port n polish the whole inlect tract and combustion chamber, inlarge the valves on the exhaust side, fit 272 duration cams with titanium springs, retainers, and collets, id install bronze guides and then dial it all in corerectly using the ecu and cam verniers as if youve got the heads off you might as well do the lot! itd probably cost about $3000 if you port your self and youd also be 85% of the way to an 8000 safe redline

like i say though this is my opionion and as we all know there are many theories to "the black art"
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Old 03-09-2006, 01:52 PM   #7
PeteDucati
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Member#: 44629
Join Date: Oct 2003
Chapter/Region: Tri-State
Location: '04WRX-Axis ej257, IPT 4eat.
Vehicle:
CNC 'd heads, cams
DB18g/EWG - F/S $8K

Default

I was hoping you actually had concrete information. I went with CNC'd heads using a v8 STi program for the specs along with Crower Stg. II cams, springs, and Ti retainers.
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