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Technical 55 ford headers

Discussion in 'The Hokey Ass Message Board' started by fine29, Aug 2, 2019.

  1. fine29
    Joined: Sep 13, 2008
    Posts: 504

    fine29
    Member
    from Des Moines

    I am in the process of putting a mild 351w in a 55 fairlane, my issue is I have gt40p heads. I bought a set of JBA gt40p headers and the passenger side fit great. The driver side however hits the steering box and the control arm. My question is will merging #6 tube into #5 cause me issues? They are 1 5/8” tubes.


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  2. fine29
    Joined: Sep 13, 2008
    Posts: 504

    fine29
    Member
    from Des Moines

    Here is what I’m thinking
     

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  3. tubman
    Joined: May 16, 2007
    Posts: 4,987

    tubman
    ALLIANCE MEMBER

    There are probably some technical reasons that you should not do it (sonic harmonics, etc., etc. etc.) but I would bet there would be no noticeable "seat of the pants" difference.
     
  4. yellow dog
    Joined: Oct 15, 2011
    Posts: 416

    yellow dog
    Member
    from san diego

    I'm sure you don't mean to run both 5 & 6 thru the same primary, right?
     
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  5. fine29
    Joined: Sep 13, 2008
    Posts: 504

    fine29
    Member
    from Des Moines

    Yes run them through the same, be it use a slightly larger primary tube and y them together or use the 1 5/8 pipe and merge them.


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  6. yellow dog
    Joined: Oct 15, 2011
    Posts: 416

    yellow dog
    Member
    from san diego

    I'm sure you know by the FO that those would be the last two cylinders that you'd want to share
    a 1-5/8 primary.
     
  7. fine29
    Joined: Sep 13, 2008
    Posts: 504

    fine29
    Member
    from Des Moines

    I guess I’m confused how it would be much different than these manifolds?
     

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    lumpy 63 and tubman like this.
  8. yellow dog
    Joined: Oct 15, 2011
    Posts: 416

    yellow dog
    Member
    from san diego

    Because manifolds are designed such that each short cylinder section immediately dumps into a much
    larger diameter chamber rather than trying to share consecutive FO cylinders in a small diameter
     
  9. miker98038
    Joined: Jan 24, 2011
    Posts: 468

    miker98038
    ALLIANCE MEMBER

    I can’t help with header calculations, and I understand you’ve got a 351. But you might take a look at the headers Red makes for those cars with the y block. The interference on the front at 5 & 6 is the same. Thunderbirds and trucks don’t use the side motor mounts, and you can buy more conventional headers for them. But the pass car units all exit at the rear. I’ve seen custom headers on 55’s and they all followed the pattern of going back and then down. Depending on transmission, the column shift and clutch become the next problem, but that might be a moot point for you. Not a good answer, but maybe a way to think outside the normal box.

    http://reds-headers.net/index.php?main_page=product_info&cPath=10&products_id=138
     

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