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Club Member
Location:
sydney
Registered:
May 2002
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Re: who has had porting done on 4AGE heads?
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Wed, 22 January 2003 09:41
 
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Start by cleaning up all the dags on the inlet side seeing as thats where youll get the most improvement for effort, you can massage the walls on the entry a little too , you can safely take up to 2mm off the valve stem guides for N/A application dont know how hat would affect the seals for a turbo though?. I think in reality if youre going to use a turbo then its probhably only worthwhile giving it a clean up and polish seeing as the HP will be coming from the turbo mostly anyhow. you only need to spend lots of time to get small gains if youre looking for every last bit of power in a N/A system.
You can also open up the exhaust a bit but theres not much gain there as it will generally be caked in carbon after about 50K anyhow.
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