I am about to begin drilling P ports. Based on the dimensions given on
 your
  main site, it appears the ports have an angle of approx. 5.5*, sloping
 down
  into the housing. Is that how it is being done? It appears from some of
 the
  photos, that the holes are perpendicular to the vertical machined surface
  of that side of the housing.

  Most of the photos of aftermarket p ports show them at a considerably
  steeper angle, and that after having had the ports threaded into the
  housing.

  Is there any reason I should not use the 5.5 degree shown on the drawing?

  Ed Carver

  We are not bothering with that. We are getting plenty of power going
  straight
  in. So far 250 HP is destroying stock flex plates left and right :)

  IMHO straight in is best  as the air must turn up as the rotor moves away
  from the port.
  IMHO angeling it down is not the way to go.

  However the racers have to get the last HP so it may or may not work for
  them.

  Dave Leonard bought this really expensive and heavy flywheel to run Reno
  and then spent more bucks to have it machined to fit Tracy's damper.
  As I recall it was seven pounds without Tracy's damper. We don't need
  the clutch surface area.

  Went 229 MPH in qualifying so he must have had at least 250 HP.

  Paul Lamar

  Paul,

 I bored my p-ports straight in.  That eased the design & fabrication of the
 intake, helping to keep things neat and compact.

 Mark S.



 Alright, straight is it. Now, do I follow the 8.55" dimension shown for
the center intersection point on the liner?, or use the higher dimension of
8.7"? Or again, the 8.6" dimension?

Ed Carver

I think we used 8.64 :) Your splitting hairs here :)

Anywhere in that range is fine.

Paul Lamar