head/intake porting who has done this???
Polishing does not help either. In fact, polishing intake ports is a very VERY bad idea (exhaust is a different story). You want the intake runner to have a uniform rough texture to promote the function of the boundary layer near the runner surface.
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As for doing it yourself, just get a few books on basic porting, your going to find the main power gains are in the bowls & a VG valve job with back-cutting the valves, get a spare set (or at least one) junk head & practice, find someone with a flow bench, so you can see where the #s are, its not all about flow #s, where the #s are is also very important, so read up on it 1st.
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Not work gasket matching. Polishing could help though, yes.