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Miata Mailing List: November 1993, Message #211
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From: Mike RotherSubject: Colder Sparkplugs? Date: Tue, 23 Nov 1993 14:29:02 -0500
I've advanced my timing to 14 deg BTDC and run 98 octane gasoline. It's been suggested that I use a colder sparkplug than stock. Would a colder plug have any effect on performance?