You don't get it andy. Anything short of a cad drawing will not even get you close to port shape. Have you ever even looked at one of Nicks motors? The only part of a rotay motor that gets machined at the factory is the first .050 in the cast iron face inside the motor. That is nothing you or anyone else have the tools or expertise to check at the track. A flat template is a perfect tool. Matches perfect, it is legal.
Grafton the only way to add material is with JB weld or similar. Housings are cast iron and then gas nitrided for wear from the factory. It is removal of material that cheats them up. Look at it as adding 20 degrees duration to a cam if you move the wall of the port. It leaves the intake open longer and has a little more volume. The runners are cast and vary so no port volume will tell you anything. Besides, flow is not always better on the bigger ports. It is really not this hard guys.
Steve Eckerich
ITS 18 Speedsource RX7
ITR RX8 (under construction)
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