[Nof55]

I the past most head gaskets were steel and by copper coating them you are sealing that gasket. new gaskets are noe manufactured not to have coatings on thwm unless as described by manufacturer. Never reuse head gasket once the seals going around the cylnder walls are crushed by torking the seal is gone for a reuse application. Using to many different types of metals on alum blocks is begging for furture problems.