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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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