560, 806, 856 have the same bell housing bolt pattern. Not the exact same shape but the bolt holes will line up.
I'd still swap front covers and back plates between the two engines before installing the 301 into a 560.
The 856 would be a direct bolt in, except the frame rails will end up being about an inch short. The diesel back plate is about 1" thicker than the gas, so the frame rails are shorter to make the sheet metal fit. Save the 806 gas frame rails if you ever think you might want to do this.
Same goes if you're putting a diesel in the 806 gas. The hood will be about 1" short of fitting unless you change out the frame rails.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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