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rattlesnakeracing
Join Date: Jan 2009
Location: Eastern North Carolina
Posts: 101
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Hot Rod!
It could have been over torqued with enough pressure to make the plug have an undetectable crack. Heat and time could have worn it enough that it finally grounded out the side and popped the plug. The correct torque with a torque wrench would be 18 to 22 Ft-lbs or 25 to 30 Nm.
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