No matter what the "experts" or ngk say. The heat expands and contracts, finding a way to seal the candles no matter what "high tech" coating ngk uses. As far as "stretch" goes, I've only adjusted them tight and a half turn since then and never had a problem. No loss of compression, nothing. You probably can't use a torque wrench unless it's a digital one, due to the amount it takes to click pounds.
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