purchased in the "Harvester" division of International Harvester which was moved within their Case heavy equipment line.
The remainder of what was International Harvester was renamed Navistar, which concentrated on engine and medium/heavy truck development.
Factory turbo vehicles received numerous additional improvements.
Pistons had an enlarged primary compression ring, added intermediate ring, an enlarged ring land and wrist pin, as well as an anodized piston face.
Consequently, these are actually International-Navistar IDI engines.
During the 1983 model year, the F250 and F350 trucks were first available with the 6.9L diesel engine.
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The International Harvester IDI (from Indirect Injection) engine is a 4-stroke 8-cylinder Diesel engine used in International Harvester trucks, Ford F-Series pickups, and Ford E-Series vans from 1983 to 1994.
Off Topic - OT - posts are allowed but should still be hobby related.
An internally wastegated, AR.82 Garrett T3 series turbo was used as the OEM for the factory turbocharger system.
The system was tuned to minimize performance loss at high elevation, rather than to improve peak performance.
A primary limiting factor to the performance potential of the engine is an incredibly restrictive stock down-pipe.
It is commonly believed, but not officially verified, that this is deliberate and due to Ford's impending release of the T444E (Powerstroke) engine.