For a show/play tractor a 3-71 would be fine. But for a "working" M, a 3-71 repower has a high risk of tearing up the transmission/rear end. (Keep in mind he M rear end is designed for about 40 HP - a 3-71 easily delivers 120 HP.)
Not certain however whether there's sufficient frame length to shoehorn in a 3-71 (it probably can but it will be tight). The shorter 3-53 would be the better choice if you really want a 3 cylinder, Detroit-powered M.
Regarding pullers running small block V8's, these develop their power by running much higher RPM's. The torque delivered to the rear end may actually be not a whole lot more that of a stock engine. Further, a puller tractor transmission only to needs handle this for a few seconds during a pull.
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Today's Featured Article - Talk of the Town: Winterizing Engines - To Drain or Not to Drain? - by Russ Berry. What is this strange attraction I have to equipment and machinery? How did I get this way? I came from the suburbs and own a small horse farm in rural Loudoun County, Virginia. You can call me a "weekend farmer." The local farmers do. Does it bother me? No. I am just happy to have their friendship. At least the word "farmer" is in my title. But what is the attraction? How can I explain the sensation and exhilaration I feel when I turn the key and hear the engine come to life (most
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