Not Ranked
IMO, yes they always need to be retorqued, both studs and bolts.
If you torque them and mark them, then go back the next day and retorque, you will find that the gaskets have compressed and the fasteners have stretched and they will torque past your mark when you redo them.
Also, this has been the only way I've found MAJOR problems in the past. I had a couple sets of aluminum heads that were not heat treated correctly and were soft. If I had not gone back to retorque, I would have never noticed it.
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