what is porting and polishing

[honda200s]

ok stupid question but what is porting and polishing. I just got a used xr200 head and cam. What can i do to this before i install it on my 200s and should i bring it to a machine shop. I dont have the jug just the top head and cam.

[CHAINSAW]

Go read the replies on this same subject you just wrote at 3.org Most of the people are on both forums, so you can pretty much ask anything you want at either one.. the same guys will answer you.. :-D

[NOS_350X]

its making the intake into the cyliner perfect so its a nice smooth flow of air