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 - Trenching With a Plow - by Staff. Introduction: This interesting information came from one of the discussion forums here at YT. We thought we should place it up front so it could be read by anyone interested in putting old iron to work. [Editor] I tried something new today, and it worked so well I thought I should post it - in case it might help someone else. I'm running 100 yards of 4" drain pipe from the gutter downspouts of our house to a pond down the hill. This should hel
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