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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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