Coolant Leaking out of Water Pump

[colyank]

If anyone can help me out with this problem that would be great. I have a 1972 c10 Chevy pickup with a 350 small block engine. Right now I am trying to install a power steering system and ran into an issue with one of the bolts on the water pump. With this bracket I have for the power steering pump, it is a slotted hole that can be adjusted in position to fit my desired position. Anyway I tried to install this bracket into the bottom hole on the driver side of the water pump, and when I removed this lower bolt coolant came rushing out. I am not that mechanically inclined when it comes to internals of engines, but I don’t understand why coolant would be poring out when I remove this bolt and how when this bolt is tight it is able to seal and prevent any leaks without any sealing application being put on the bolt and just relying on the threads to seal. It is just a little bit worrisome for me that coolant is able to escape from this bolt hole, as the top most bolt of the driver side of the water pump when removed nothing comes out of that. If anyone can help explain this I would appreciate it.