i just put a combine 404 into a 4230 it was a fairly simple swap i kept the turbo and made a custom air intake so it would look original. i also had the late model combine motor. on the 4020 though youll have to look to see if the blocks are the same i believe the early 404(4020) and the late 404(some time in the mid 70's they switched) use a different block with a a different bolt pattern.should be able to look at where it bolts to clutch housing and tell maybe measure to make sure. if your blocks do match you will need to use the tractor oil pan and the sump(sump in combine doesnt go down quite as far. there are bolts in the oil pan that go into the clutch housing combine doesnt have these on its pan.
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Today's Featured Article - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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