A picture of the inside of the rotor housing would not do you much
good unless it was taken exactly aligned with the port center line.
That would take a camera that could focus in a few inches. Most
cameras need at least 1.5' to focus. With Paul's style of ports there
is no dog leg so you could take it from outside the housing.
   The hole comes through a curved surface. With an off axis picture
the shape would not be telling of what is really there.
    Purely speculation, but I bet that the hole is round and the
optical illusion created by the intersection of the hole with the
curved surface is what make people think it is not round. Of course I
wouldn't bet much.

This thread has pics (bottom of the page) of some Mazda Factory Racing
housings - both rectangular and D shape.
What Lemans used is anyone's guess.
  http://www.rx7club.com/showthread.php?t=144200&page=26&pp=15

Cheers
Cary



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