Hello,
Long time since I posted last time. Below is an update so you don't think I abandoned this thread.
Update on the "abominable" water pump fifth bolt:
The right waterpump bolt pump put a heck of a fight to come out. Probably being my very first sized one made it much harder for me to get it out. Two extractors broke adding to the task. I tried heat, welding a nut (more than one), until I could drill out the broken bolt and run a tap.
Welding a nut allowed me to remove a piece of broken extractor #1. The bolt was sized for good and kept breaking in pieces most likely due to the welding heat not being enough the break the rust. What did the trick was using a carbide drill bit. I reinstalled the water pump and used the water jacket orifice as a guide to drill through the bolt. That took care a piece of extractor #2 left in the broken bolt and the bolt itself. Then, I removed the water pump and run a tap to rethread the hole.
I decided to put the left water pump removal on-hold as it apears to be in a good condition to run the engine enough to assess its overal health. I learned a lot on the process and can say I got it out without damaging anything. It did take a many weekends as I couldn't work continuously on it. Probably a good thing because it tested my patience.
Here some pictures:
Cheers,
-Conrad