I have a 1981 F350 it originally came with a 351M and once I installed a Eldelbrock Performer cam and a 4 bbl. it didn't run too bad. Still kinda weak and would bend pushrods if you got the rpm up too high. Got maybe 7 mpg pulling the trailer ?
Then I got the bright idea to change it over to a 460. I found an old tire center truck 1985 ? and bought it. Ford's are not the best for interchanging engines, but I made it work. Used the same carb.as I ran on the 351M on the 460 and gained 1 mpg on the trailer up to 8 mpg.But gained ALOT more pulling power ! I imagine the 460 cam is stock ? 460's are VERY good engines stay away from the 351M-400 , but a 351W isn't too bad , but not for pulling. Most love the 7.3l diesel but I do think they are too high maintenance and the fuel costs too much so I doubt you gain anything other then bragging rights unless you are pulling full time.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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