ok so ive alot about this but i havent got a clue what it does basicly what is the theory behind it and what performance gains are you looking at
port and polished head
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#1
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#2what it does is opens the ports up abit and polishes the tunnels so the air flows easier and quicker good mod for cams give better increase in power.
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#3so its not worth doing unless you get cams
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#4you see more of the difference with cams in.
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#5How much will it do (bhp) wise with and without cams?
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#6It's not giving bhp. It's giving better response. That's one of the things you must do if you put cams.
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#7what place can port and polished the head for you?
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#8i think there no point doin it unless you get cams I think anyway cus it the cams that will be the major improvement and the head polish just assists it i think