Dartin for Divorce

Johnny Dart said
Getting old fittings out of an intake:
1.Heat the fitting up red hot.
2.Put paraffin wax on the fitting so the wax melts into the threads.
3.Now smack the fitting with a big ******* hammer. This "Shocks" the fitting.
4.Clamp down on the fitting with some vise grips, and twist it off.

PS: No need to drill a water neck. You already have a hole for a temp sensor.

See that's all perspective. I think drilling and taping a thermostat housing is a better idea than heating and beating on an intake manifold pipe plug that someone else put in, and left to corrode! Your way may leave the manifold useless if someone less skilled tries to remove it. My way, the manifold lives on! To each his own.