NOS 340 EXHAUST manifold

Mopar Exhaust Systems

  1. Treblig

    Treblig FABO Gold Member FABO Gold Member

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    I'm puzzled?? I have this NOS, never been used, covered with cosmoline, dealer tagged 340 manifold. Normally I would just sell it like all the other manifolds I sell but it seems to have a casting date of 1978 WHICH IS IMPOSSIBLE!!! From my research I know that these manifolds were made up to 1973 for the Dart, Challenger and Barracuda. It has the signature 1 7/8" exhaust hole like all the other (small hole) 340 manifolds I have so that part makes it a correct 340 manifold even though the year/date makes no sense. The part casting/number is also correct and very crisp just like the clock time. Can anyone make sense of this anomaly??? This would make a great addition to somebody's restoration.

    PS - The cosmoline makes some of the casting numbers/letters a little unclear, they are actually very crisp (in person) but I don't want to rub the cosmoline off because it's probably been in this state for 40 years. I did remove a little cosmoline from the year date because I was looking for a "73" but found an "78" and couldn't believe it so I removed some of the cosmoline to make sure.

    thanks,
    treblig
     

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  2. Treblig

    Treblig FABO Gold Member FABO Gold Member

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    NOBODY???

    treblig
     
  3. 68gtxman

    68gtxman I used to reMember FABO Gold Member

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    Cast later for replacements? Maybe they didn't cast enough shelf stock during the first year runs.
     
  4. Dubob

    Dubob Well-Known Member

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    My guess at best is that they still would have been manufacturing service parts into 78. The cars were only 5 or 6 years old at that point. But as I stated that's just a guess.
     
  5. mvh

    mvh FABO Gold Member FABO Gold Member

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    Yeah, I don't see why it couldn't be a service part. In fact, it must have been, as it was obviously not installed on a car from the factory. Probably was the last batch of that part, though.
     
  6. fratzog lover

    fratzog lover Well-Known Member

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    Armbruster motors is still in business. Selling Buicks.
     
  7. Treblig

    Treblig FABO Gold Member FABO Gold Member

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    That would be interesting because all the Mopar exhaust manifold casting number charts don't show any after '73. I thought maybe the last number was just cast wrong?? I've never seen one with a casting date later than '73 (maybe '74), I wonder if anybody else has??

    treblig
     
  8. Treblig

    Treblig FABO Gold Member FABO Gold Member

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    Fratzog...that's amazing!! I didn't think anyone would bother to read the tag. The tag also has lots of info on it, maybe I need to look at it a little closer??

    treblig
     
  9. 75Sport

    75Sport Grandpa

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    I have a later dated manifold exactly like that but dated 1977. I know where mine came from. A motor home with and original 360. I assumed they continued casting that pattern for RV and other odd applications. Dan
     
  10. RedFish

    RedFish Well-Known Member

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    78 was a good year for cast iron or metallurgy. LOL
    The fact that the heat riser is new draws my interest.
     
  11. Treblig

    Treblig FABO Gold Member FABO Gold Member

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    Yes, the heat riser has a thick coat of cosmoline smathered on it. You can see the shiny surface of the metal under the coating.

    treblig
     
  12. Treblig

    Treblig FABO Gold Member FABO Gold Member

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    Thanks for that 75Sport. It makes a little more sense now!! It's funny that the Mopar exhaust manifold casting number chart doesn't show these used on motor homes. So I guess Mopar used them where ever they needed a little more power (like a motor home).

    treblig
     
  13. pishta

    pishta I know I'm right....

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    Whats 340 about it, the 1 7/8? I had a service manager work with me and he told me they stocked/produced stock for 7 years after production.. some sort of regulation...could have been blowing smoke.
     
  14. 4spdragtop

    4spdragtop FABO Gold Member FABO Gold Member

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    check the tag on it for a date.
     
  15. Treblig

    Treblig FABO Gold Member FABO Gold Member

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    The casting number (3418623) and the size of the exhaust hole is the only way you can tell a 340 (like this one) from the regular non-hipo manifold. A regular non-hipo 318 manifold has a 1 5/8" as opposed to 1 7/8".
    Unless someone else has more/better information....
    Treblig
     
  16. Treblig

    Treblig FABO Gold Member FABO Gold Member

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    I'll do that!! I don't want to open the plastic package in order to keep it completely NOS.

    treblig
     
  17. jerry6

    jerry6 Banned

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    That's the best before date , you have to throw it out , it has gone bad .
     
  18. Treblig

    Treblig FABO Gold Member FABO Gold Member

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    Your right!! I have to "throw it out" in the "Mechanical Parts" for sale Section...LOL!! I have no use for it but I know someone else probably does??
     
  19. oldkimmer

    oldkimmer FABO Gold Member FABO Gold Member

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    ...........I have had a 340 with a casting date of 7/11/77..............kim..........
     
  20. Treblig

    Treblig FABO Gold Member FABO Gold Member

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    Oldkimmer, I think that kinda explains it. If you had one with a '77 casting date then Mopar must of kept casting them well past 73/74. Now it makes a little more sense. I thought since the "3" could have been mis-cast as a "8" it would have made sense but with your post I realize that they must have kept casting them longer.
    "75Sport" has a similar story and "Pishta" says that he was told that they kept producing them long after '73. I think the mystery is solved, now I can put it up for sale knowing that it's legit!!

    thanks,
    Gil
     
  21. Treblig

    Treblig FABO Gold Member FABO Gold Member

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    I checked the tag for a date and wouldn't you know it.... I can read 197XXXX, where the last number would be on the paper it's stained and torn. Even with a magnifying glass I can't make it out!!

    treblig
     
  22. crackedback

    crackedback FABO Gold Member FABO Gold Member

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    Awesome exhaust manifold for that 78 motorhome resto!

    Not much value to a numbers freak because of the cast date.
     
  23. Treblig

    Treblig FABO Gold Member FABO Gold Member

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    Yes, wouldn't work for an all original resto but it's brand new and many members use them on the early A bodies because they fit and flow better than the stock 273/318 manifolds. The 340 manifolds like this one have a 1 7/8" exhaust hole while the stock 273-318 has a 1 5/8" exhaust hole. Why would someone buy a used one when they can get a brand new one??

    treblig
     
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