Yes I agree they are hard to find. I had an extra one (just as a spare) sitting around for about 12 years until I made a long distance move last year then I sold it. The 336 comes in two versions and the bigger crank journal type is found in loaders and bulldozers etc, but will bolt right into a 680 as well. Some guys have put Detroit diesels in the 680's also but then there is a lot more retrofitting before you're done.
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Today's Featured Article - Haying Before Tractors - by Owen Clark. Hi guys! At age 8 (1927, am now 79) I was learning how to drive a stacker team on the old homemade A-frame wooden stacker, on three of my uncles` dairy farms in Star Valley Wyoming (south of Jackson Hole, on the Wyoming-Idaho border). There was one steam tractor in the Valley, owned by an entrepeneur who used it to run his grain threshing machine, that he hauled from farm to farm for the fall harvest. We used teams of horses not only on the stacker, but on the buckrake to buck the dried
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