Originally posted by DemonSVT: Why are the ports an the 98/98.5 UIM smaller then the 99+ UIM? Not sure how you are measuring the hole size, but calipers is not the way to get an accurate reading.
Digital caliper with 2" levers.
I measured the port size and final 2" taper. I took multiple measurements around the arc and averaged the results.
I realize that using just the outward lip diameter of the port would give erroneous readings. For one thing the ports are not even round.
For that matter this is the same way I port matched and tapered all the work I have done. I am not kidding folks when I say the Demon is in the detail work. Smooth equal transitions are key.
2000 SVT #674
13.47 @ 102 - All Motor!
It was not broke; Yet I fixed it anyway.
Not sure how you are measuring the hole size, but calipers is not the way to get an accurate reading. 
