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 - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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