Heres a copy of the PM I sent to mjc:
When you remove the throttle body and look at it, you'll see that the areas in the front and back of the plate are rough. The idea is to smooth it out.
I personally like using a Dremel and sanding drum for this kind of work. Some people think the Dremels are too weak and prefer to use a die grinder with a grinding bit. Whatever you prefer is what to use. The Dremel is easier for me to control in small areas, so I'd rather take longer and no have any screw ups then use a bulky die grinder and have to worry about taking a chunk out of an area where I don't want to.
Its a real easy job. I didn't even bother removing the plate. The areas close to the plate are smooth, so they don't really need to be touched. Whatever you do though, make sure you get
ALL the residue out. Last thing you need is for metal bits to be running through your motor.
The intake manifold and head ports can be done almost the same way. I haven't gotten that far yet though.
