Here is an excellent used waterfall removed from a 348 engine that I had 40 years ago. I removed the water pump to keep because it did not leak and it was tight as a rock spins freely and no casting problems. There were casting number 375-5797. Note the date code is F 1660 therefore the date code is May 16 of 1960 casting date so this can be used on any 58 through 61 Chevrolet 348 and is number matching for a 1960!