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Technical Flathead 8BA Offenhauser 1075 intake manifold

Discussion in 'The Hokey Ass Message Board' started by Jonesi, Apr 22, 2020.

  1. Jonesi
    Joined: Apr 5, 2020
    Posts: 23

    Jonesi
    Member

    Hi!

    I'm installing an Offenhauser 1075 dual intake manifold.
    Now I'm stuck at the threaded hole under the rear carburetor.
    I have left over an air vent line from the gas tank, as I think it is.
    What size does the thread have? Is it unf or unc?

    Thanks for help! 7F946DDA-EEBD-41E7-9CB4-62CBB8FD17DA_1_105_c.jpeg
     
  2. 42merc
    Joined: Dec 19, 2010
    Posts: 891

    42merc
    Member

    Vacuum fitting goes there, for the wipers.
    Probably is 3/8"- 24 thread (fine) or 1/8" pipe thread. Just use a short bolt to plug it if not needed.
     
    stillrunners and Jonesi like this.
  3. Jonesi
    Joined: Apr 5, 2020
    Posts: 23

    Jonesi
    Member

    Would be nice if somebody knew exactly as inch threads are not common in Germany and I have to order all online. I hate it to wait just for a fucking screw
    Thank you guys!
    In that short time I‘m in this forum I got good help! Would have saved me lots of Dollares if I would have joined earlier. Seems like Flatheads are eating $$$
     
  4. 42merc
    Joined: Dec 19, 2010
    Posts: 891

    42merc
    Member

    Jonesi - I went to the garage & checked an Edelbrock & Weiand intake, don't have an Offy.
    3/8"- 24 thread works. A short (1/2") long bolt with a thread sealer would work .
    Flatheads eat a lot of money, but older Cadillac's are not far behind in cost.
     
    town sedan and Desoto291Hemi like this.

  5. Jonesi
    Joined: Apr 5, 2020
    Posts: 23

    Jonesi
    Member

    Now I know, it’s the vacuum for the brake booster
     
  6. Some of the 8ba's had a vacuum dizzy as well.
     

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