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A similar plug with a shorter reach might be an easier and safer alternitve to modifying the plug, and it would remove a greater volume(but still probably less than 1cc) The electrode wouldn't be as exposed, the odd shape of the combustion chamber could be an issue as noted by t vago. any way of doing this would leave the threads of the spark plug hole exposed which could cause a hot spot, creating the problem you were tring to avoid
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