Paul do you have a Dxf file for the p-port? I have a machine
 shop here, that will CNC machine both rotor housings for $150.

Tony

Great price. $75 each. How can you go wrong?
I predict in the next ten years you can sell hundreds.

No DXF for the rotor housings. I'll send the dimensions
shortly. Basically there is a 1.875" diameter hole all
the way through and a 2 inch diameter counter bore down to the
steel liner that the intake tubes seat on.

I just sent you the first two slide throttle parts.
Here are two more.

The O rings grooves in the Teflon slide are optional.
You can add them later if you feel you need them.
I don't think they are necessary.