spark plug gap
#4
Also if you overtorque them it is possible to crack the ceramic insulator. But I kinda doubt you really overtorqued them. I've been using a torque wrench on mine when installing them, and its WAY tighter than what I used to do. The torque spec is around 12 ft-lbs. Its actually important that the plugs are torqued porperly, a loose plug will not dissapate heat they way it was designed to, and if too tight (well you already know after the last responses you got).
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