Spark plug heat range has more to do with the amount of the ceramic insulator nose surface exposed to combustion gasses. Hotter plugs will have a longer insulator nose, resulting in more heat absorbed from the combustion gases. In addition the heat must travel a greater distance thru the ceramic insulator to reach the cool metal spark plug shell.
Heat conduction of ceramic is very poor relative to steel, therefore I would not expect adding another metal gasket to be significant relative to the plugs operating temperature.
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Today's Featured Article - The Niagra View Mobile - Powered by a 1959 Ford Tractor - by Mark Massey. In 1959 the Niagara Frontier Transit Inc. of Buffalo, New York designed and built six Viewmobiles for the Niagara Frontier Sightseeing Inc. for use as a sightseeing ride at the Niagara Falls State Park, Niagara Falls, New York, powered by a 1959 Ford 611 Tractor.
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