Yeah, a big boost Cossie uses a metal or similar gasket, in the 90s people had copper rings added and many like my 2.2 Stroker have 10 long studs machines in to the block to help stop the head lifting off at high boost.
the Duratec’ is quite a modern engine and was used in twin turbo form in the noble, have a look
at Guy Martins 170mph plus Transit that he raced, that had a boosted Duartec V6.