Most of the critical fasteners on these engines are "torque to yield" type that should not be reused or retorqued; they should be replaced as the old ones will not give you a true reading.
That said, rarely can you correct a blown head gasket by retorquing the head due to component warping.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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