I assumed cast iron (MGB). But Bill brings up a good point: alloy vs iron.
The collection of rolling stock in my .sig file has all-sorts as combos of iron and alloy. Each requires its own different proceedure if re-torqued. The Alfa (alloy head, wet-liners in an alloy block) is the biggest PITA: torque, heat to "normal operating temp", cool to ambient, retorque... "wash, rinse, repeat."
And don't EVEN think of rolling off in "winter" climes until the temp gauge at least twitches off the peg.
When I lived in western PA I used to buy Alfa head gaskets by the ~six-pack~!! /bcforum/images/%%GRAEMLIN_URL%%/jester.gif