I may be using the wrong term for it. But it’s basically a piece of metal (usually on the intake manifold gasket). I’ve seen some vids where they block it off with a price of metal. Plugs the hole in the intake side of the head. Not sure if all makes sense. If not I’ll take a pic of the part I’m talking about when I go out this evening to fire it off and make sure my thermostat housing isn’t leaking.
