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 - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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