Getting (polished) Head (s)
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Getting (polished) Head (s)
Has anyone done any head work on thier cars I am looking specifically forwhat type of work was done, the cost , and the gains, also what type of shop did the work.
Think of porting polishing and balancing the motor but i have had a tough time finding anyone to do the work and even fewerwho will commit to what it will give me
Think of porting polishing and balancing the motor but i have had a tough time finding anyone to do the work and even fewerwho will commit to what it will give me
Registered User
Joined: Nov 2002
Posts: 1,780
From: San Diego
Car Info: Boosted Geo Prizm
It's not worth it. It's better if you start off with the STi RA heads as they have much larger valves to begin with. Then if you want to port and polich that, then go for it.
As for balance and blue printing, thats up to you, and is more for race built engines then anything.
As for balance and blue printing, thats up to you, and is more for race built engines then anything.
I disagree. The STI and WRX head castings are identical. Good headwork-porting (no polishing) will make a dramatic change in the power band. While your in there-upgrading to larger SS valves would be simple enough. Good cams for your app would further improve things.
Registered User
Joined: Nov 2002
Posts: 1,780
From: San Diego
Car Info: Boosted Geo Prizm
Originally posted by DeliciouSpeed
I disagree. The STI and WRX head castings are identical. Good headwork-porting (no polishing) will make a dramatic change in the power band. While your in there-upgrading to larger SS valves would be simple enough. Good cams for your app would further improve things.
I disagree. The STI and WRX head castings are identical. Good headwork-porting (no polishing) will make a dramatic change in the power band. While your in there-upgrading to larger SS valves would be simple enough. Good cams for your app would further improve things.
Here is a quote from Clark @ DynoComp
The US heads as I have said many times before, are V6 castings. V6 castings had provisions for AVCS and some V6 cars had AVCS. As we recently learned. Not all V7 Ej207 STI engines have the same heads. Early exampls where simply V6 motors and used the older castings exactly like the US car. Later V7 STI engines came standard with the new updated large port heads. As a result they made more power.
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neillmatic
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Aug 22, 2005 04:14 PM