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Depends on model year.(carb or F-I)
Are the plugs the correct type/heat range. Did you have a cleanair filter. When reading plugs, it`s best to have the motor hot. Make a top end run and shut it down. But you could blast it on the freeway, take it home and let it cool and get a good reading too. IMHO
Just cant start them cold and expect a clean plug.[8D]
Why did you pull the plug for inspection.
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