Just as a data point, I would plug my 300w heater in the night before flying and throw a blanket over the cowl and seal the inlets. After 12 hours or so, it was nice and warm, but I never once worried that it was going to get "too hot". The engine is 500 pounds of metal (with cooling fins, no less)...
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WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
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Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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