Broke my water pump bolt. Now what? (Update - broken bolt is out)

RedFish said

Exhaust manifold bolts are a but different from water pump bolts. They are smaller 5/16" diameter. Most go through a fairly thine ear on that manifold. Nothing much for it to seize to except the head. Several of the 3/8" water pump bolts go through the timing cover before entering the block so if they are seized they can be seized to that also.
The one close picture we have doesn't really show what this broken bolt goes through but with the approx' 3 threads showing it may be directly into the block and not through a timing cover.

Click to expand...

Not on a /6. Yeah they go thru the timing cover on a small block for sure.
If he tried the red loctite idea understand that the once the loctite was in the nut, the nut on the stub, that it would have to sit a good while and allowed to "set up" like at least overnight before he tried to undo it. I agree it probably won't work but being the most likely source of corrosion was the dissimilar metals with the steel bolt, cast iron block and aluminum water pump, and the water pump was able to be slid over the remains, it may well not be stuck all that right in the block ..
I too would have had it out before this thread got to be more than 5 posts long. ..