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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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