Quote:
Originally Posted by Seadog
The 100 octane mods specify different plugs. Typically you will not want to run 87 octane in an engine with 100 octane plugs.
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According to AP1590B A.L. 4 (November 1940) the different sparking plugs are "very desirable" but not required. So using 100 octane with the regular sparking plugs seems to work, however it doesn't sound like a good idea. In addition it doesn't mean that the 100 octane plugs work satisfactory with 87 octane.