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I also read that new plugs and reused plugs are to be tightened to different values. If eusing plug you tighten to 18.5 foot lbs vs new at 22. , problem is i have read so much recently i cant remember where i saw it .
Can anyone confirm? when i did the valve covers i went to check a plug and it was barely finger tight but looked in great shape so just want to re tighten.
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