Perhaps this is not a 320 but a 40 - added a couple photos if anyone can tell. According to jd40.com, the engine number would fit into the 2/8/1954 category.
Also, I might be mistaken on the sleeves. When I looked inside the block it seemed like it but with the pistons out I buffed an area on the top of the block and it looks to be stock. The cylinder casting must run long inward a bit on these.
I'm guessing either there is not much time on the engine or these were pretty long lasting. I find no ridge, the cylinder looks to be right at 4.00 bore, the main a hair under 2.400 and the rod journal a hair under 2.5. Too bad it was so rusted up inside the engine - the rest of the tractor seems great.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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