I would not expect 321 to crack and fail in thermal  cycles  below

1600

     > degrees.  I don't know how
     > hot the cool tube will become but if it does not reach 1600

degrees

     > then no problem, ever.    Jerry

Jerry, my two cents worth is this- why risk it? I thought I'd just use a

heater core since we are using a liquid cooled engine, but then I saw that
someone (don't remember who) just took air from

the back side of the radiator. This way, you don't  have the worries of

an exhaust leak, and don't have the worries of the weight and potential
failures  of a heater core.

Brian Trubee

Using a heater core seems the perfect solution.  Set it up so that the
heater core can be used for climb out on hot days and just dump the air
outside, this should give the additional cooling that many seem to be
looking for in climb.

Bryan

 
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