Depends on what type of chisel you are wanting to use. I had a 7 shank 3 point that was a load at about6" deep on my 5000 Ford, the 4000 only would handle 5 shanks and they were on 12" spacing. Now if you are talking about a disc chisel then they will be on a 15" spacing if like was made when I had mine or now possibly a wider spacing yet and the deeper you want to go the wider you need to be so for that depth I think you are looking at a disk chisel with the 15" spacing and it would take at least twice the horsepower per shank of the Ford unit that I had and at 6" and 8 hp per shank it was a load and only used it on higher rolling ground that was in bean stubble so sod would take a lot more. I am thinking that the depth you are wanting to go with other conditions figure at least 25 (not 20) horsepower per shank. so it would not be over a 4 shank disk chisel and have not heard of any of less than 5 shanks. Now if you want a plain 12" spacing unit and 6" deep then a 7 shank mounted would work. And they will not work in corn stalks.
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