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The 6.5L turbo diesel is supposed to be a pretty reliable engine, if underpowered. It is the same powerplant that is in the M1151 up armored HMMWV. From what I understand, they'll last a long time, as long as they aren't run too hard. Apparently they are prone to blowing head gaskets and headbolts when abused (much like any other diesel engine, this seems to be the weak point). I've got no experience with them outside of the HMMWV, and I just drove/rode in them. All info I've gotten is from the interweb. Good luck!
From what I've seen, they're pretty decent. You have to relocate the fuel module to keep it cool...pretty easy. I've done a couple pumps, and seen a timing chain break (or maybe it was the key way, icr) and bend all the valves/push rods on one, but rarely anything major.
I've heard that a lot of the block issues you read about on the net are referring to the Oldsmobile 350ci diesel blocks. Apparently there are a lot of web-wheelers who think they're the same block. Could be wrong, but that's my impression.
I just quickly browsed the link that I gave, and I must say that some folks have really done their due diligence and put together a stack of information that is impressive!here is an example of what I just found. http://www.dieselplace.com/forum/7233738-post10.html
As always gents, I am glad to be here for a consolidation of input with things beyond me. Thanks for your help, guess we'll see how tomorrow goes.