Timing Cover Coolant Leak I've Never Seen Before

Bob D said
The cover on my 273 started leaking it was a pin hole. My said put a little JB Weld and it will be fine. I couldn't do that and I pulled the cover. Glad I did, the inside looked like the surface of the moon. The inside was heavily deep pitted all over. Electrolysis is taking place and attacking the weaker metal the aluminum. If it was and outboard motor at a dock you attach a zinc tab. I just added a couple of extra grounding cables the engine along with a kill switch. We'll see how that works.
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Once my coffee level is adequate I am sure I am going to find the same thing you're describing once I get the water pump off based off of all the corrosion I am seeing in the inlets and outlets. I am glad I reached out and didn't just do the gut redneck thing I usually would and JB Weld it. It would have been a very short lived fix. Assuming I can actually get it running once I can get it to hold all of its fluids in...lol.