so in the car... you might need to remove the radiator depending on what type drill motor you own. Regardless how you drill it out... you first need to get on center. So.... dry fit the water pump on with most of the bolts. Use a bit the same diameter as the hole in the water pump casting as a pilot to drill 1/8 to 3/16 deep ( I can't really see how deep the off center drill went )
to create a true center.
I don't like easy outs. If I can step my drill size to sneak up on the threads minor diameter, I'll get the hull out. Usually drive a keen angle ground tool in behind the hull to collapse it.
Even if you ended up with a on size clear hole you could put a longer bolt and a nut there.
And use sharp drill bits so you don't push hard, easier to drill straight. New bits aren't so expense if you trying to avoid pulling the timing cover. That usually snowballs into new timing set or more.
