The best mileage was an L8000 Ford that I used to have with a 8.3 Cummins 250 hp I got as much as 9.25 mpg driving exactly by the speed limit, but usually 8.75 to 9 mpg was the standard, so if you rebuild it keep us posted and please don't call them come apart, I have more faith on those old engines than any other, specially the new tech, my next truck will have a BCIII loaded to the gills. Cummins 855, NH 250, and NT 220 Parts Overhaul Kits Overhaul Gasket Sets Turbochargers Cylinder Heads Cooling System Fuel System Camshafts Pistons &. First use of the Holset HT3B turbocharger. Top Stop injectors modified to Direct Fuel Feed.
Screw an LT4 hotcam they are junk, look into the Comp cam extreme energy grinds, the 230/236.050 will go good with the above combo I laid out, but it is ALWAYS better to get a custom grind. Cummins listened to it customers and designed a more.
The features in this engine were: New pressed steel oil pans instead of aluminum, a very noticeable feature. A custom grind cam, spend the extra 50/100 to get one. The N14 engine is the follow up to the vastly popular Cummins 855 Big Cam which was produced 1976-1985. I love these motors and let me tell you how fuel efficient they are, down here where I live (Florida Keys) we go to Miami for all our loads,flat sea level ground second the best fuel mileage that we have experience here come from a Big Cam III 350, 378 Pete dump truck 8.5 mpg that's loaded one way with 70K lbs but consider that City driving, this truck has now over 2 million miles and 1.3 millions on the last inframe, still put 450 to 500 miles a day and only use a gallon of oil betwin oil change which the last four or five years have been at 20k miles, there are a few other trucks with them Big cams reporting 8 mpg, same roads same loads. Big Cam III Big Cam III engines were introduced in 1983.
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