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Not sure what the specs are for the Rocket, but the plugs I just bought for my car had the torque specs on the box. 15 - 20 NM I believe. So the 18 NM you have sounds right.
My father is an old mechanic and he said the way they always did it was to tighten them down till the crush washer, then another half turn. Not sure where that puts you as far as torque, but seems like a good rule of thumb. I guess I always just made them as tight as they were when I took them out.
rash
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