Jerry Hey wrote:

Paul, attached is a drawing of the housing with the Leman P Port and
Exhaust housing done by Mark Wrathall.  I added the dimensions.  This
drawing is based on the j-peg in the tech article.  This drawing can
be confirmed if it agrees with the numbers published by Paul Yaw for
p.port opening and closing.  Does anybody want to tackle that?
The intake port seems to be opening earlier  than  the Racing Beat
port (photo).
  Jerry

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