Do you mean that the manifold extension pipe doesn't thread into the manifold? I have never seen or heard of a muffler that would screw directly into the manifold. The pipe that screws into the manifold is something like 1 3/8 inch water pipe (don't quote me on the diameter), nothing special about it. You can find used manifolds at antique tractor shows and swap meets, and new ones are probably available on this site, worthington ag parts, or any other large parts supplier. I wouldn't even begin to worry about the lack of backpressure damaging the valves. Our M ran for 2 or 3 years with cracks through the manifold until we found a cheap replacement. I'd worry more about water or foreign objects and critters getting in the motor through the gap. Many of the old farmalls were run without mufflers back in the day with the thought that it gave a little more horsepower.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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