[Shepard]

I was asked about how to port a head. Its hard to explain in words other then knock off all square edges and round them. Again I suggest using a dremel with a flex shaft over a die grinder and 1/4" bits. It's easy to over do things when your cutting as fast as a carbide burr removes metal. Plus you can reach deeper with the shaft handle.
I don't polish the intake port as a certain amount of roughness is helpful in vaporizing the fuel air mix.
I try to make my exhaust port like a horn to the exhaust flange.