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Originally Posted by Rocky Rotella
Sorry I didn't see this earlier. Thanks for the info guys, we now know more about the assembly line!
The shot on the HPP website is much smaller than the actual photo and it was clearly "ZN" in the larger shot. The only ZN I could find in any reference was a 400 in 1973.
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OK then. I had to pull out the '73 Service Manual on this one as the later '73 engines don't list the ZN. As you can see, it lists the Y8 as being a SD engine. But that was probably scrapped when they had to redesign for new emission standards and renamed it XD.