Quote:
Originally posted by Randy Webb
Wil, If the proper torque caused a stud to snap, then it was bad anyway and you saved yourself the problem of it snapping while the engine was running.
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Sorry, but this is not good advice! The factory specs for these head studs are specified for a fully lubricated nut and washer. Surely by the time that you retorque them, the lubrication is gone, and you will be over tightening them - potentially breaking them. It is for this reason that Bruce Anderson told me he doesn't recommend retightening the head studs after 1000 miles of a rebuild - he says that you can't achieve a proper torque.
This is why in the Engine Rebuild book, I recommend using anti-seize compound, instead of motor oil as a lubricant. In this manner, you have some hope of getting closer to the factory specs, instead of a retorque after all of the oil has burned off. I feel that you do need to retorque after 1000 miles, as everything loosens up.
I do recommend a retorque on magnesium cases, but you rarely need to do it on the aluminum cases (the ones that used the Dilavar studs) as the aluminum doesn't creep like the magnesium.
-Wayne