There are 2 different upright mufflers available. The one with the longer bottom section probably is a retrofit for early models. I have always been under the impression that when the CA came out that the B also was changed to the style with the short bottom section. All of the ones I have and have worked on from around 1951 and later had the big hole in the hood that appears to be factory. If not someone done a very nice job cutting them. There is also another style brace that came out before the one you have that bolted to 2 of the valve cover bolts and had a clamp that attached it to the body of the muffler. Unfortunately I do not have one on site now to take a picture of it. I have also learned over the years that it is impossible to be 100% sure of anything when it comes to tractors and what the factory done at times. Lee
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Today's Featured Article - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
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