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Dual Spark Plug Flatheads?

Discussion in 'The Hokey Ass Message Board' started by flattop49, Sep 20, 2006.

  1. I got as set of Flatattack twin plug heads, the plugs are side by side. They were cast by Mike Davidson from Aussie a few years back, he was going to run them at lake Gardiner salt flats. I ran them in my dragster with a twin distributor setup, had an HEI on the Right side of the engine with the front cover modifed to take a Mallory supermag 2 on the left. I will post a couple of pictures. It worked real nice.
     
  2. Mr 42
    Joined: Mar 27, 2003
    Posts: 1,207

    Mr 42
    Member
    from Sweden

    Here is my set :)
    Remade in Sweden, from NOS Elco Twin Heads.

    Nash Twin Eight Dizzy
     

    Attached Files:

    Last edited: Oct 8, 2010
  3. strombergs97
    Joined: May 22, 2006
    Posts: 1,888

    strombergs97
    Member
    from California

    Jim Lattin made the heads when I made his 4x2 staggered intake.
    Duane..
     
  4. 97
    Joined: May 18, 2005
    Posts: 1,563

    97
    Member

    I think I've seen that!!:D:D
     
  5. rschilp
    Joined: Sep 17, 2009
    Posts: 677

    rschilp
    Member

    That's the "mid-size" Seagrave fire engine, 586ci, based on the pierce arrow design

    That is my old post, and I've since bought that fire truck including the engine.

    906ci is the big Seagrave, the one shown is "only" 568ci, it's the same as mine.

    The ignition setup on these seem fun. The big ones (906ci) actually had a dual ignition setup with a distributor for one set of plugs and two magnetos for the other set, so you essentially ran 3 distributors for a 12 cylinder with 2 sets of plugs.. talk about timing nightmare. The manual for the seagrave actually says not to run both spark plugs at the same time.
     
    Last edited: Oct 9, 2010
  6. tubman
    Joined: May 16, 2007
    Posts: 4,858

    tubman
    ALLIANCE MEMBER

    Rob,

    If you check, you'll find the "small" Seagrave is 468 ci, not 568. (I have the original delivery data for my truck, and that's what it says.)
     
  7. rschilp
    Joined: Sep 17, 2009
    Posts: 677

    rschilp
    Member

    My research shows 3 engines. A 468, 586 and a 906, there are several threads on here about them.
     
  8. THE SPEED ADDICT
    Joined: Mar 31, 2007
    Posts: 356

    THE SPEED ADDICT
    Member

    Here's a flatty that was at Sacramento auto museum.

    zsacr1.jpg
     
  9. Magnus B
    Joined: Jun 19, 2005
    Posts: 885

    Magnus B
    Member

    Dusting off an old thread. But does anyone have any pics, or stories about home made dual plug heads? It wouldn't be hard to do, but did anyone do it back in the day? I guess based on the strange things that surfaces the answer is yes. But it would be cool to hear the stories and see the pics.

    Thanks,
    Magnus
     
  10. RichFox
    Joined: Dec 3, 2006
    Posts: 9,883

    RichFox
    ALLIANCE MEMBER

    If you go back to post #40 you can see the twin plug head for a Plymouth that I made. If i wanted to have twin plug Ford V8 heads I think I would bore holes in conventional heads and weld in the new plug boss. Easy with aluminum.
     
  11. Magnus B
    Joined: Jun 19, 2005
    Posts: 885

    Magnus B
    Member

    Thanks Rich. Yes that was exactly my thinking. Would it be sacrilegious to do this to a pair of old Weiand heads? :rolleyes:
     
  12. RichFox
    Joined: Dec 3, 2006
    Posts: 9,883

    RichFox
    ALLIANCE MEMBER

    Not to me. But really old heads have ofter been surfaced too often or are corroded. I think I would buy new. But I am on SS now. It's taxpayers money. What do I care.
     
  13. alchemy
    Joined: Sep 27, 2002
    Posts: 15,143

    alchemy
    ALLIANCE MEMBER

    Ol' Ron recently posted pics on the Fordbarn of some heads he added the second set of plugs to. I think they were new Offy's or Edelbrocks.
     
  14. Kiwi 4d
    Joined: Sep 16, 2006
    Posts: 2,661

    Kiwi 4d
    ALLIANCE MEMBER

    image.jpg
    First made in NZ by Ron Hogan way back. Now new and improved version available again in NZ. image.jpg
     
  15. Very nice, have you got more details? How much are they? Who sells them and what dizzy is used?
    Cheers
    Ralf
     
  16. Kiwi 4d
    Joined: Sep 16, 2006
    Posts: 2,661

    Kiwi 4d
    ALLIANCE MEMBER

  17. RAREBIKE
    Joined: Oct 17, 2006
    Posts: 452

    RAREBIKE
    Member

    Lincoln V12 Two Piece Twin Plug heads, made by Norm Fricke.
    101_2724.JPG
     
    greasemonkey54 likes this.

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