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Old 07-30-2009, 03:58 AM   #1
SanMan
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Member#: 120579
Join Date: Jul 2006
Chapter/Region: International
Vehicle:
1995 STi V2 Wagon
Silver

Default Port Heads or Not - Built Motor

Hi People,
Need some expert proven advise on the build of my motor. This is what is being built -
EJ25 703 Block
Nitride 2.5L Crank
ACL Bearings
Manley H Rods
100mm Manley Pistons
GT3076r Turbo rotated external wastegate
850cc Deutchwerks Injectors
Link ECU
Aquamist 1s - 50% Methanol Injection
Custom FMIC
Now the question I have is with my STi V4 heads... should I port them or not?
Who has seen proven power from porting?
Many thanks,
San-
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Old 07-30-2009, 05:48 AM   #2
DemiSlayer
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Member#: 120339
Join Date: Jul 2006
Chapter/Region: RMIC
Location: Utah
Vehicle:
02 WRX
Alliance Motor Sports

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Power is in the head work.
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Old 07-30-2009, 07:23 AM   #3
SanMan
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1995 STi V2 Wagon
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Ok.. So where can you show me improved flow rates..exhaust or intake or both, how much should you take off? What about matching the head cylinder section with the actual block cylinders and round that?.
Where spring valves lifter combos...
A little bit more info please chaps?
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Old 07-30-2009, 10:28 AM   #4
FuJi K
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Join Date: Jan 2001
Chapter/Region: MWSOC
Location: St. Paul, MN
Vehicle:
MY99 GF4 JDM 6spd
NF Performance

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not much work needed to be done with those Ver. IV heads.
Blend the valve seats with the port runners on all the ports. do a 3angle valve job and you're all good to go.
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Old 07-30-2009, 10:50 AM   #5
SanMan
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1995 STi V2 Wagon
Silver

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thanks for the reply... how are the ver4 head diff?
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Old 07-31-2009, 01:31 AM   #6
FuJi K
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Join Date: Jan 2001
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Location: St. Paul, MN
Vehicle:
MY99 GF4 JDM 6spd
NF Performance

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Here's an EJ20K
http://psituned.com/gallery/photos/5.jpg

they are plenty big. USDM heads don't compare especially 04-06 EJ257 heads.
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Old 07-31-2009, 05:00 AM   #7
SanMan
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1995 STi V2 Wagon
Silver

Default

Thanks for the info... will google and ask more questions if stuck
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