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whatever the sparkplug tells you.

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Correction.....Whatever the MPH on the ET slip shows you....

IMHO the only reason to look at plugs is to make sure that they all look the same so you know that they're all getting an equal amount of air and fuel to each cylinder...and to look for signs of detonation if you're on running on the edge of barely having enough octane to keep you out of detonation...

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he's on a engine dyno