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 - Restoration Story: 1951 Farmall H - by The Red (John Fritz). I have been a collector of Farmall tractors since 1990 when I first obtained part of the family farm in Eastern Indiana. My current collection includes a 1938 F20, 1945 H, 1946 H, and the recently purchased 1951 H. This article will focus on what I encountered and what I did to bring the 1951 NEAR DEATH Farmall H back to life.
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