RE: TR-6 intake manifold.

["DEHAAS, MARK" <dehaasm@napc-1.navy.mil>]

  I think that heating pipe in the intake manifold aids in vaporizing
the air/fuel mixture and also prevents carburetor icing.  If anyone
has driven in a fog or rainy day with the ambient temp. hovering around
freezing without a "heat riser" that moist air will freeze inside
the carb until the engine reaches its proper operating temp.  Frozen
carbs are no fun.  Especially if you are coming of an exit ramp and
the throttle is frozen wide open!

Mark deHaas.