Hey Mike!
Wow, you're really digging deep into that Detroit! I've been away from here, got busy on other projects, and then my wife was in the hospital since November so I was a bit occupied, but I did see your PM that you got a new HEMTT... Awesome!
Instead of a spin-on oil filter adapter, you can get a direct spin-on replacement housing, this is for the 92-series only... See attached pic. It's Detroit part number 5104413. They're out there on Google. It's from HET and PLS trucks.
Boy those liners really got cooked. The 92 series is particularly sensitive to heat, and they don't like to be lugged. On a mountain grade, a good rule of thumb is that you should be holding your speed without the pedal to the floor. If you do put the pedal to the floor, you should still be able to accelerate up the hill. If you can only hold speed with your foot to the floor, or you can't accelerate anymore when you do floor it, it's probably time to let the speed come down a bit and drop to a lower gear.
Obviously you've already been told about Bus Grease Monkey... I really like his videos, it's amazing how fast he can do an inframe on a 92...
My HEMTT is down as well... Radiator replacement. It was dripping when I bought the truck, and I managed to find a NOS replacement. The leak mysteriously stopped for a while, but then it started gushing out a steady stream from the middle of the core. I'd love to attend the Plymouth event but....... I doubt it will happen. While the radiator is out, I'm doing a bunch of other work. Belts, hoses, water pump, air conditioning, block heater, coolant filter, and I'm going to paint the engine.
Regards,
Jon