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Help Identify this Int/Exh Manifold

Discussion in '40- & 55-Series Tech' started by Spike Strip, Oct 12, 2017.

  1. Spike Strip

    Spike Strip Adorable Deplorable SILVER Star

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    Came across this NOS 2F Manifold combo and it was unusual to me because it does not have the emissions stuff or what I've seen on US-spec parts. Also, it has not been machined for a 'warm up flap' to direct heat to the underside of the intake which leads me to believe it must be ME spec?

    Any other opinions?

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    upload_2017-10-12_13-5-15.png


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  2. Spike Strip

    Spike Strip Adorable Deplorable SILVER Star

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  3. Mace

    Mace rock scientist.. Staff Member s-Moderator

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    I was always under the impression that the warm up flap reduced hot air to the intake..
     
  4. Spike Strip

    Spike Strip Adorable Deplorable SILVER Star

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    When ambient cold, hot exhaust is directed to the underside of the intake, speeding warm ups and aiding vaporization. The thermo-spring expands when warm and moves the flap to direct exhaust to/out the down pipe... At least that's my understanding, until corrected :)
     
  5. Mace

    Mace rock scientist.. Staff Member s-Moderator

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    Exactly, without the flap, hot air will always be routed to the intake manifold..
     
  6. Spike Strip

    Spike Strip Adorable Deplorable SILVER Star

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    Without the flap I would think there is no directed flow.

    But my understanding of the Bimetal spring was reversed.


    upload_2017-10-12_14-13-0.png
     
  7. Mace

    Mace rock scientist.. Staff Member s-Moderator

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    So, if you take the flap out, you always have hot air hitting the intake..

    Regardless, I have seen a intake manifold like that. But for the life of me I don't know where..
     
    Last edited: Oct 12, 2017
  8. Spike Strip

    Spike Strip Adorable Deplorable SILVER Star

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    No machining for heat shields, either...
     
  9. Mace

    Mace rock scientist.. Staff Member s-Moderator

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    "cold" weather package?
     
  10. Tysano

    Tysano

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  11. 65swb45

    65swb45 Supporting Vendor

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    PCV hook up and PN are a match for 75-78. Lack of the butterfly? News to me. Maybe JDM.
     
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  12. Spike Strip

    Spike Strip Adorable Deplorable SILVER Star

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    Maybe it was the last manifold off the line and the machinist at Mountain iron works said, 'F-it, I'm goin' to lunch'. Or maybe I'm thinking of Kaiser.