LMAO oh, that's funny..
I've resorted to using inside protractors that I scribed marks on every 1/2" along the sides, so that I can duplicate CSA in various regions in the port. 1 for width, and 1 for height.
Do you know what's CRAZY about the whole porting deal. Some areas don't matter. You could grind and grind away and throw it on the flowbench and the numbers didn't go up, or down. Get the throat at the recommended percentage of the valve (88-91% some guys will push this number) I won't, get the right shape and air speed, and move on. Exhaust side I was taught different.
