archer1.8 Posted December 5, 2012 Share Posted December 5, 2012 Well I have a crack developing in one of my cast iron collectors. Was able to source another manifold from a generous member on here, and my friend suggested porting them. I have ported the heads on my AMC 401 V8 a few months ago and it was pretty easy. So I was wondering how deep should I go porting the collectors. I have seen people go only a few inches all the way to hog the whole thing out. I am more concerned about not losing any spool then power up top. Faster spool and mid-range is what I am looking for. My other question is I will be replacing my UP with an STi UP. I have seen people not porting the port that connects to the UP if they are using a stock UP. Is this true? Link to comment Share on other sites More sharing options...
archer1.8 Posted December 7, 2012 Author Share Posted December 7, 2012 anyone Link to comment Share on other sites More sharing options...
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