X Code on eBay factory eXpeimental dual quad nailhead

Discussion in ''Da Nailhead' started by SpecialWagon65, Jan 28, 2015.

  1. SpecialWagon65

    SpecialWagon65 Ted Nagel

  2. Ken Mild

    Ken Mild King of 18 Year Resto's

    Is there anyone left alive that could verify its experimental status? Sure is a nice piece.
  3. jamhdit

    jamhdit Just nuts about buick's

    can anyone see any differences to the regular dual quad besides that its aluminum?
  4. Marty World

    Marty World Well-Known Member

    Good morning.

    Carb spacing is greater than the stock dual quad intake; 8 1/2" versus 8".

    Also the intake sits up a little higher, about 7/8".

  5. SpecialWagon65

    SpecialWagon65 Ted Nagel


    Attached Files:

  6. jmos4

    jmos4 Well-Known Member


    Last year I had the pleasure of speaking with Dennis Manner at the back to the bricks show in Flint , guess one of his first tasks at Buick was the dual quad intake and he told me that those were indeed engineering prototypes. Guess engineering had access to their own casting department.

    I believe all x-castings were preproduction prototypes on all the GM brands

  7. Topcat

    Topcat Got TORQUE?

    I don't know but something is funny about this one....just seems too tall and the carb flanges too thick and the x-tag too crisp........very interesting indeed.

    An EELCO experiment ?.......below is a picture of mine........Ted....you got a good picture of yours ?


    Peace WildBill
  8. SpecialWagon65

    SpecialWagon65 Ted Nagel


    Check out the trunion- it is a custom one I had made the is 1/2" longer
  9. SpecialWagon65

    SpecialWagon65 Ted Nagel

  10. Topcat

    Topcat Got TORQUE?

    So....it looks very much like yours Ted........just taller.

    Very interesting.....very interesting indeed.

    Peace WildBill
  11. 66GSconv.

    66GSconv. Well-Known Member

    In the pics on Ebay there seems to be a hole drilled in the runner in the 3pic. and the 5 pic. what would be the reason for this?
  12. Xporcelli

    Xporcelli Gold Level Contributor

    Any idea of how many X manifolds were cast and how so many escaped the factory/engineering depts? Between Bill, Ted and eBay, that's at least 3. Just wondering-
  13. whatever

    whatever Well-Known Member

    There's a huge number of those intakes! If not so, they wouldn't be so widely spread.
    My guess would be that they could have been given/sold to racers for test reasons, as Buick experimental dept. was quite involved in 60s drag racing. Hot Rod magazines of the period might give a clue as well.
  14. stage169

    stage169 Well-Known Member

    You can see the back hole on pic 1 also. Vacuum reference and maybe the other two were added to see if there was a difference between the three? No clue but the cast in locations are all on the same side and maybe that is because of the dual plane type layout? Never seen one but I think you should buy it Greg! :Brow: Get that engine back on the dyno and get it tuned with that dual quad!!!
  15. dual-quadism

    dual-quadism Black on Black

    I still have my X-intake, as well. Will post some pics. Mine is a late production prototype. Carb spacing and height are same as the cast iron production version. They were mocking up the AC brackets holes and other small details, but the overall casting is same as production. From ones I have seen/heard of, I think there are about 5 floating around in various stages of production readiness.
  16. wkillgs

    wkillgs Gold Level Contributor

Share This Page