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Even with my stubby muffler the loudness is manageable for about 30 minutes, but with the stack in the factory location the noise gets to be fork-in-the-ear sorta fatiguing. The stack behind the cab would help or a spiral, noise reducing insert like @Lonnie installed could help.

I found a way to add a front jake head (25B) without cutting the hood panel - only notching the hood stiffener cross member.

I also wonder about this especially with these being designed AFTER we had the 7.5 ton Mack NO with its massive cab. That being said, I like the proportions of a small cab with a massive hood!

Do you know what kind of engine the intake and cross over came off of? It looks like you could still fit 2 jake heads (front & back) with that setup 😁

That setup looks good, clean, open, and simple. I like the retention of the cold start pieces and I'm glad I didn't see any plumber's tape anywhere.

I see, I see. I've read a few opinions on what max pressure a small cam can handle and they very between 200-230 psi. What pressure would be your max and have you come across any official number from Cummins?

How does a needle valve on the gauge affect the pressure that the pump puts out?

That first picture truck looks a bit like a KM-500. What are your eventual plans for your truck? Full resto?

Was there only one?

I saw The Untouchable 5-ton at the Auburn, Washington 2024 Veteran's Day parade this year so I'm assuming it's not the one listed from New Jersey (can't confirm, however). I don't have any details other than these pics:

Looks like enough gold to warrant free entry into the lowrider show!

With the heater drawing in warm air from the cab on continuous recirc, the heater should get nice & toasty. Brazing the leak shut on the heater would be a more affordable option than replacing with the new $230 units...just an idea...

Here's a pic with the tab flipped over to let the lever engage. Looks like it starts out flat and then gets a twist.

I twisted mine off from over tightening so I cut off the male threads and drilled & tapped for 1/8 NPT female threads to use a nipple. If you can drill straight and tap straighter it could be a way to fix your misalignment (don't tap too deep).

I got the truck all tucked in for a cozy winter hibernation in a heated shop. It's the first time ever that it has been indoors and I'm afraid it may get spoiled 😁. While it’s hanging out here, i think I'll finally do the battery box mods like @Brutacus did a while back.

Your M923 is part of the M939 series so start looking here: https://www.steelsoldiers.com/threads/m939-series-tms.218395/ The M920 is part of the M916 series of trucks (completely different) The NHC-250 is 855 cid (14 liter) and is a pretty good engine.

Does the engine bar over by hand? And the battery is connected for 24 volts?

If you haven't done it yet, it may be time to do the dual fuel mod with new fuel line routing.

Gonna do an autopsy and report back?

Just in case...Army Surplus Warehouse up in Idaho Falls has chains for 16.00R20s