I'm certainly no expert on polishing for asthetics, but have ported and polished many intakes and cylinder heads in my years of racing and they have similiar hard-to-reach places. Do you have a small rotory tool like a Dremmel? If so, there is a wide array of sanding drums, wire brushes (coarse to very, very fine), and polishing wheels for them. I use them all the time for this detail work, and I bet these will work for you too, but you'll be taking it a step beyond me for the mirror finish. In fact, I'm sure of this because a friend of mine (a gunsmith and restorer) who is "schooling" me on polishing for asthetics, uses a Dremmel to detail the weapons he works on.
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