Keith,. I think you are requesting the part number stamped on the machined surface of the casting. 300 C received the following "1854123". A typical serial number would be a 7 digit. One of mine is 1158513 another is 1156911. Of course these special transmissions were often switched with what ever was available when service was required. Any comments would be appreciated.
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Someone gave me a casting number I need to look for a year or so ago, and I've misplaced it.
The Torqueflite for a '57 300C is said to have a different casting number from the standard models. As I am looking at old Torqueflites, I would appreciate it if someone can provide this number to me again so I don't end up with the wrong model.