stripped threads after cylinder head torque.

[Gunnar_HH]

Re-use of a gasket.
The issue is sensitive. It depends.

If you have a gasket that does not settle when you tighten the screws, it can be reused.
A metal gasket made of 5 layers of sheet steel can be used a second time. A gasket made of carton with a deforming sheet metal, the profile has taken on a certain shape and can no longer be used.

best regards
Gunnar