What can be confusing is the C264 engine blocks that IH used are the same size as the C281 blocks. In the original SM and 400 thicker sleeves with 4 inch diameter pistons were used. In the C281 thin sleeves with 4-1/8 diameter pistons were used. Most SM and 400 tractors got the bigger pistons and sleeves put in at rebuilds over the years, making them a 281 cubic inch. In 1956 a change was made on 400 tractors to the piston, piston pins and connecting rods to use a smaller pin. Small pin was used in all C281. 4inch and 4-1/8 pistons were made in both piston pin sizes. Also adapter piston pin bushings for small end of connecting rod are made so a small pin piston will work with early connecting rods. Its not to unusual to find a block with C281 on the side in tractors before the 450 because IH sold some to replace failed blocks from previous tractors. Some can be found with a date code at least 10 years after 1958. More confusing is some blocks cast in the sixties have C-248 on the side but are actually the same block bore size as the C-264 and C-281.
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