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Generally you will want a cold spark plug for an alcohol engine and a hot spark plug for a gas engine.

Supercharged engines on methanol will benefit from a Heat Range of: 9, 10 or 11 or corresponding Champion or Denso.

Naturally Aspirated Alcohol engines will use: a 8 – 9 Heat Range.

Gas engines will benefit – from a hotter plug like a 6 or 7 heat range.

The higher the effective compression (Static compression + Boost) the colder the plug should be.

Heat Range Cross Reference Chart