Lynn
 > We just ran across the pictures of the homemade PPort housing we had
stored.
 > Noticed that the factory PPort doesn't have the liner in the exhaust

port.

 > Is that the way they do it?
 > If so does the housing ever have any problem with the heat on the

aluminum?

 > Royce

    Not a problem at all. The liner keeps the EGT a bit higher for better
reactor
    performance and a bit less heat going into the coolant, but none of this
is
    detectable by any means short of expensive instrumentation. For anything
short
    of racing, the port diameter produced by removing the liner is a bit too
big. It
    doesn't hurt anything to be in there, and at 6,500 RPM there is no cost
in HP.
     When the liner is removed for a race engine, the outer ring is replaced
with an
     aluminum replica to keep the port under 2 inches ID.

     Lynn E. Hanover

 
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