263 , you can look at the left side of the block up by the head and it should say as the engine s/n and CID is stamped there unless it has a replacement engine in it then it is hard to tell with out pulling the head . It also could be a 263 to 291 conversion . I have done some that way over the years and i get one that has a C D class bore because unless you get the big buck sleeve kits from Case I H everything is geared to the A B class bores and ya end up with sleeves that are to small and they will snap off the lip and get sucked down around the crank . So i get the 263to 291 conversion and bore the block to one size and make it a 291 .
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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