i was putting my head back on my car, i torqued it down to 58lbs car was running ok but i get nock every once and awhile high levels on the safc2, someone told me i was suppose to reloosen the head bolts back out then torque to 14lbs is this true ? and why? i thought they were crazy .. also could this be the problem of my nock the head was just rebuilt with new valves was ported and milled. please i need to know what to do now.

Wrong section for 4g63 talk my friend. Not many here are going to know specs for a 4g motor anyway. Do you not have a chiltons manual? I do not know much about those motors but I can tell you that there is no way headbolt torque is 14 lbs/ft.

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2012 2500HD LML

How much was the head milled? If it was milled enough to raise the CR, then you could be experiencing Knock. Some of the local 4g guys have been discussing the affect not having your cam gears degreed in perfectly may have on "phantom knock" also. Just some thoughts for you, but you should really check the 4g63 forum for better answers.

chilton book says loosen to 14lbs i freaked when i saw it. ho wcan this be ? no on ein the 4g63 area will answer me. milling was small i had the head put on before and there was no knock it was the second time taking it off and putting it back on.