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dont make it to big!!!! and dont polish it, it needs to be a rough. wut big bore and wut carb u runnin? if a 88 s stage or sumthing like it then make the intake about 19-20mm and same for exhast, and match the intake to that. also, when u do it, make the port as strait of a shot as possible, so shave the one side of it but not the outside its like a turn on the track, if u could cut the track ona 90 degree turn where would u go? inside of the tire, banner, etc. to make it striat, same with ur ports. make it strait, make it big but not to big, and dont poilish it.
 

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YA WHAT SANOBRADY SAID

BUT ONLY POLISH THE EXHAUST AND DO THE INTAKE THE SAME AS WHAT SIZE CARB YOUR RUNING

(18MM CARB = 18MM PORT )

(20MM CARB = 20MM PORT )

EXHAUST PORT TRY TO GET IT THE SAME SIZE AS THE INSIDE OF YOUR HEAD PIPE AND YOU SHOULD BE GOOD
 

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yup, and if the connection of the header to ur head is diff (headers to small) u can shave it down a bit to make it flow a bit smoother rather than hitting the striat up edge of the header
 
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