I have just purchased a new to me disc that I believe is a model 370. I have a model 37 with nine blades per side in front. This disc has ten.
What size are these two discs?
 
Need more information. They were made with a 7" or 9" blade spacing and could also be gotten with one spacing on front section and the other on the rear section so need to know blade spacing. Once I know that I can look up the width of cut in my No. 37 book. The 9 blade would be 2 1/2' wider with the 9" spacing over the 7" spacing.
 
I have an IH 370 disk which measures 14 feet across the rear. It has 12 blades per side at 7" spacing. So I would say if you 10 blades per side at 7" spacing, it might be a 12 ft. So just measure your disk across the back and then you will know. An IH dealer once told me that's how you measure the IH disks. Al
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That is how it is listed in the owners manual, back gang set in full cut and at the end of axle. 7 blade 7" is 8'8", 8 blade is 9'10", 9 blade is 11'0", 10 blade is 12'2". Now if it is a 9" blade spacing on a 10 blade model you have 9 spacings that are 2" wider or 18" on each gang or a total of 36" more on width so a 10 blade 9" spacing would be 15'2". So blade spacing does make a big difference. At a 7" spacing a 17" wore down 18" blade will do good but on a 9" spacing you need what was the optional 20" blades to break up the dirt space between the blades.
 

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