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It seems to depend on the engine and it's use as to if you need to retorque. My rece engine with steel studs needed to be retorqued after a few hours because the nuts loosened. They have held since the retorque. I'm certain that most engines don't need to be retorqued but it doesn't hurt anything to check.
-Andy
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72 Carrera RS replica, Spec 911 racer
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