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Bill: Glad to hear your responce. If you notice I did phrase that as a question. I bought in Nova Scotia a new 510 plow 5x16 bottoms in 1975. The 710 plow had been on the market some 10 years then while the 510 about 5 years. The 710 had more clearance both vertical and horizontal, thus had already become the plow of choice for farmers plowing trash such as corn stalks, as was the practice in 1970s. I can tell you that when I bought my plow the 710 in 5x16 size was a lot more money than the 510 in 5x16. Of course the 710 went on to become the 720, basically the same plow with some improvments. By the same sign the 510 had replaced the 540, 550 and 560 being 4,5 and 6 bottom, in the early 70s The 510 had a much heavier frame and a bit more clearence than the 540, 550 and 560. If you also take notice in my question, I did say general area. Back in the 60s and 70s I did travel quite extensively in Eastern Canada and New England. While at that time we were plowing down some corn stalks, we were still quite heavily into hay, corn and beans rotation, thus we were probably quite satisfied with the 510 plow. The 510 was an excellent sod plow. By the same sign in those days the corn belt growers were probably looking for more clearence, thus I can see them going 710 all the way. The other fact that would be interesting to know, is what percentage of 540, 550, 560 and 510 plows were built in relation to 710 and 720. Another question also is what effect is notill having on plows for sale in a given area. I can also say I have seen numerous used machines of different makes, trucked a 1000 miles, only to find a local dealer knew nothing about the machine. I have seen that one several times in my lifetime. There were areas of this continant certain models of all machines were never sold. I was not trying to nail specific areas of the 510 plow as such, but merely suggesting something to watch for when buying plow books.
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