Walter, I used to have a 6.5 in my pickup, now powered by 5.9 Cummins (5 sp 4x4 4.10 gears). With the 6.5, I actually got better mileage than the Cummins empty, about same loaded. My experience with 6.2/6.5s (owned one for 25 year, worked on them in the military, is when power and mileage droop, and the engine idle is not crisp, the timing chain is worn and timing retards. Likely, your timing is now 9-11 ATDC. It needs to be 5.0 - 4.0. One of the best, cheapest upgrades I did was to replace the timing chain with timing gear set sold on the diesel page. Set it once for the life of the engine. Times just like a 350. The engine will run cooler, start better, rev better and mileage will improve.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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