I have found this information on a other site so now i know (1940 - 1963 Buick Parts Book says 1959 and 1960 all Series engines used the same pump whether or not A/C equipped. Same pump used on 1961 all big series engines less A/C. Part number is 1389414. Don't know the casting #.
Hope this helps. )http://forums.aaca.org/f162/60-buick...-c-245457.html
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