Hey Mike,
As always, thanks for the thorough documentation and analysis.
I’m hoping work starts on my other garage building in June, so that I can bring the Savage here and get it on the road. Currently it lives 2 hours away.
It’ll prob be in the high 30 HP range, so hopefully not frag the way yours did.
When we were racing a 250 Bultaco and an SR500 Yamaha, I had those motors apart a lot. More so the Bulto, of course. By the time it was done, it made roghly double the stock HP, so parts wore out in a hurry. I used Loctite on the main bearings into the cases. That was long ago, but I don’t think I used Green sleeve and bushing mount, as I never would have gotten the cases apart. I’ve def used green Loctite on bearings with a loose fit where it was the only way to save the fit without doing a bore/sleeve operation.
When my XL250 Honda puked, I believe it was balls/races. That was 40 years ago, so memories are a bit thin. I didn’t fix it, just sold it as a basket case.
The Bulto was born with ball bearings on both sides. I swapped to a roller bearing on the right (drive) side and used a balll bearing on the left to keep the crank in place. BMW used a f*g barrel roller bearing on rear of the crank on their higher output R69S in the 1960s. Norton used a roller bearing on the cranks of the later big twins after massive crank bearing failures. It was  a Superblend, and I believe it had a slight barrel shape to the rollers. IIRC, the Norton cranks would flex something like 13 degrees off centerline at redline, The ball bearings couldn’t take that kind of off center load and blew their lunch.
I’d def take the oil pump apart on yours and look for scoring. As little fun as it is, I’d prob press the crank apart and check the big end pin for scoring.
One thing I do on BMW trans rebuilds is take a gunsmithing brass bore brush, put it on a cordless drill, and run it through the trans shafts. Lots of caked on swarf in there that wants to come loose in a nice hot oil bath.  I’m assuming the Savage trans shafts are hollow for oil flow, so I wonder if this can be done?
I have a magnetic drain plug in my Savage. I used to rip apart the paper oil filters on bikes that I was worried about to look for debris.
Again, thanks for all your hard work and great documentation!
Can’t wait to see the next installment.

Thank you for taking the time. It is greatly appreciated. Nicely done sir