I would not advise trying to port your own head. Places that do it machine them out and have flow-benches. If you have some dremel skills, you can go in and clean up some rough edges etc, but I wouldnt try and full on port it yourself.
Its for the stock head. I am not sure what they do exactly. I wouldnt think for $80 they put bigger valves in, I beleive they change the size and shape of the tunnels. I do not know much about porting I was just stating the price I had heard from someone.
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