I’ll take you at your word. That era of diesel I always preferred the International DT-466.

 

I have a 1983 LN700 semi tractor with an 8.2 Detroit 4 cycle V-8, 5 speed with a 2 speed rear axle, air brakes etc, not the most powerful thing in the world, but very dependable, starts easily and gets excellent fuel mileage, pulling a 32' drop deck trailer, grossed to about 30,000#, 10.7 mpg. Supposedly the worst engine ever made, but you surely can't convince me of that, fine running virtually vibration free engine with an oh so cool V-8 diesel sound,

 

Although I still want to think that the truck that started this discussion is a two-stroke --- it runs, revs, sounds, and drives like a two-stroke --- I am beginning to believe that it must be the V-8 8.2 exactly as you describe; it has to be the most economical on fuel of anything I ever drove, including my fleet of 1st Gen. 6BT Cummins trucks that seem to have more fuel in the tanks after a trip than I had when I started; and, I definitely don't cut this truck any slack.
Chopping silage on steep Kentucky hillside corn ground, I really wind it up at the ends of the rows in order to make the turn and have it back under the silage spout without the tractor ever having to wait for me.


I see this is your first post; welcome to the forum.

 

Was it an engine swap as LN700, "L" series "N" short hood single drive "T" denotes tandem drive 700 is a petrol engine


8.2 fuel pincher like the Cat 3208 were great engines in their given environment ie delivery short haul, construction etc. but were quickly run into the ground used as OTR long haul.

 

If its fuel efficient, its probably not an 8v71. I drove one for several years and it was a pig. Post a couple pictures.

 

Post a picture of it or look underneath it at rest, if there's a pool of oil, it's a two stroke. They weren't called leakers for nothing.