6.9 was a diesel built from an exisiting gas-engine platform by International Harvester. Later 7.3 was the same engine with a slightly bigger bore until mid-1994. Powerstroke 7.3 that came out late 1994 was an enhanced and modifed version of the original IDI 7.3. Many companies built diesels from exisiting gas engines. GM, Isuzu, Hercules, Continental, and many more. Most were fine, but the early GM Oldsmobile 350s not so good.
I've seen several IH tractors with 6.9s - all home built. No pictures. Here are a few of a GM 6.2 in a Massey Ferguson. 6.2 came out about the same time as the 6.9, but was a weaker engine with a lighter block, timing chain, and a cast-iron crankshaft. The IH 6.9 had a heavy block, forged-steel crank and gear-drive cam.
As to stories about turbo 6.9s being great on fuel? You "can't make a silk purse out of a sow's ear" and the 6.9 was just an indirect injected diesel using the Ricardo Comet system, just like the GM 6.2s and 6.5s. Ford DID put a turbo on the 7.3s which are basically the same engine. No, not great on fuel. I'm still driving my 85 F250 with a 6.9 as well as my 1994 turbo 7.3. Ford used the ATS turbo system.
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