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

Matt Prather wrote:

I don't think you get enough temperature rise by just piping air off
the back side of the radiator - especially in the winter when you need
the heater the most and the input air is the coldest.  You could put
a winterization kit of sorts on it.  Feed cabin air via scat tube up to
a duct mounted on the corner of the radiator, and then heated air from
the same corner of the radiator back to the cabin.

It still seems slicker to mount a small heater core in the cabin.  Maybe
slightly heavier, though.

Regards,

Matt-

-- William wrote:

my heater core fan combo.
Bill Schertz
KIS Cruiser # 4045

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