Dad and I are in the final stages of bringing back to life a 400 like yours; T/A delete and standard PTO. It's frustrating to find a major problem on an otherwise good project tractor but it happens.
Is the crank such that #2 is all the way at the bottom? The sleeve being ruptured out means a rupture in the water jacket. It will not be practical to repair the block vs. finding a replacement. I could put my hands on a couple of them today.
If the whole machine is fairly low time and the trans is good it's worth saving. Even the rest of the motor parts: crank, oil pump etc. will have less wear and be worth saving.
If the M turns out to have a bad trans but good motor you could use that one.
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Today's Featured Article - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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