Jerry Hey wrote:

Paul,  on your drawing of the pp modification you have the instruction
to "Port the Inner Part with a die grinder to square it up,"   what are
your referring to?  Does the port transition from round on the  outside
to square on the inside?   

Yes. Here is a picture of a racing beat PP.
The drawing is of Ken Powell'e variable timing PP but
it shows the dimensions of the square. You should round off
the corners.

Can you provide a drawing showing the inner
shape?   Also, is there a throttle body available as you have drawn it,
or one  that can be modified?   Jerry

You will have to make that part. Two throttle bodies are used. One for
each rotor housing. Gives a better idle when the butterflies are close
to the rotor housing.
 
Paul Lamar
 
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