A cool collar connot possibly aid in cooling any more than a set of finned valve covers.
RADIATORS cool car engines, even those of the air cooled variety.
The thermal load presented upon accelleration is orders of magnitude more than the suface area of the cool collar or valve cover fins can handle. That is why cooling systems for the track are so much more involved. Just look at the trouble Jack has gone through. That gives an idea of the kind of heat produced when driven hard.
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