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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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