Originally Posted by aznpoopy

i've snapped one myself. fwiw i could NOT get that sucker out with an ezout.

one option is to just leave it in there (i assume it's still watertight), and bleed the coolant by raising the nose of the car and running it with the radiator cap off. car will bleed fine.

i would personally take the manifold off if you're deadset on drilling it out. i suspect it's not totally necessary, but getting the manifold off isn't much more work once you've disconnected the coolant hoses and drained the coolant system anyway.