The sleeveless C221 most likely came out of a combine. The other difference you will find is the sleeveless block will not have threaded holes in the back of the block. You will need to use longer bolts with nuts.
When changing piston style you have to make sure that your head will work with the new pistons. Early heads work only with the stepped pistons. They are flat over about 1/2 of the piston and then the rest is combustion chamber. The combustion chambers on the later heads start to go up at angle near the edge of the piston and have the necessary clearance for the Fire Crater pistons.
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Today's Featured Article - Gettin My Old Tractor Home - by Clayton Sweeney. My name is Clayton Sweeney. I am from Southern Maryland in a small town called Lothian. I am 20 and my father and I are the proud owner of a 1954 Allis Chalmers WD-45. When I was 18, I dated a girl in the next county over. Her family are tobacco farmers. It was a cold Thanksgiving evening, and we were going up to her Grandparents house. As we passed one of their barns, I noticed something orange in the corner of my eye in this old shed. It was pretty dark and I asked what it was
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