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My experience is identical to "kbecker" above. My plane is a 1973 C337G naturally aspirated. Essentially the same airplane as "kbecker's." The only thing I would add is if I do get stuck with a lengthy (8-10 minutes) wait on the ground (very common at my home airport), any turn into the wind solves the problem. If the breeze is blowing into the air intakes, heating is a non-issue. Tail wind or cross wind and I watch the rear engine heat up to 400 degrees CHT with the engine at idle. During the take-off, by the time I'm reaching for the gear handle, the temps are back down to a more comfortable 350 CHT while initial climb speed is 120 MPH and cowl flaps open.
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