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ENGINE: Utica Engine Numbers for 55th-56th Series V8
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Packard engines (and Ultramatic transmissions) built at the Utica plant had a unique serial number applied - independent of the vehicle serial number. This serial number also included an identifying prefix.

For an explanation of Utica engine number prefixes for 56th Series, see:


A subsequent post in that same thread reveals three prefixes used for 55th Series Packards:


Images showing both Utica engine number stamping locations can be found here:


Posted on: 2009/5/20 15:04
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