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Both engine displacements had bore of 3 7/16 in. The 251 had a 4 1/2 stroke and the 265 had a 4 3/4 stroke.
I went to my car parts books and found a head numbered 1120 796 used on DeSoto and Chrysler of that
time period, but I cannot find the displacement for it. Do you know if your engine was originally used
in a car or truck? A truck parts manual might have that head. My parts book goes through 1954 so
that head might be a slightly later year. The long number you quote is the serial number of the block and I don't
have a book to match that to a particular engine. GCW
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