I found two nice things on spark plug heat dissipation:
1st article:
http://www.iridiumpower.com/heatranges.htm
Quote:
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Heat Dissipation in a spark plug. Of the 100% heat generated from the combustion, 20% is absorbed by fresh air from the intake of the following stroke. 58% of the heat is absorbed by the walls of the cylinder head which hold the spark plug in place. Twenty percent is absorbed by the insulator and side walls of the plug, the remaining 2% being absorbed by the spark plug wires.
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2nd article:
http://www.centuryperformance.com/spark.asp
I'm sure there are more on the web but those two were at the top of my search.