![]() 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. If your current head has 1.50 OD valve springs, you will need to order item 166225 instead. ![]() ![]() ![]() 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. ![]()
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