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Technical Stephens overhead valve conversion to flathead v8

Discussion in 'Traditional Hot Rods' started by carshopowner, Jan 6, 2012.

  1. carshopowner
    Joined: May 2, 2010
    Posts: 407

    carshopowner
    Member

  2. I saw these on youtube and searched the HAMB to see if it had been posted before and I came across your thread, so bump.

    <iframe width="640" height="360" src="//www.youtube.com/embed/PGbXF4lD_pg" frameborder="0" allowfullscreen></iframe>

    <iframe width="640" height="360" src="//www.youtube.com/embed/21kd_wkR9V0" frameborder="0" allowfullscreen></iframe>

    <iframe width="640" height="360" src="//www.youtube.com/embed/eHs5-F_IMjo" frameborder="0" allowfullscreen></iframe>
     
    Stogy likes this.
  3. draider
    Joined: Jul 12, 2004
    Posts: 461

    draider
    Member
    from Texas

    Very cool, I hadn't heard of Stephens before. I wonder how many sets they produced? They look like true hemispherical heads? Also looks like there's not much oil getting to the topend.
     
  4. Bearing Burner
    Joined: Mar 2, 2009
    Posts: 854

    Bearing Burner
    Member
    from W. MA

    I saw an add for Stepheds heads in an early '50s Hot Rod. I never knew if any were ever made. First pictures I have ever seen.
     
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  5. That's something you don't see everyday.
     
  6. the-rodster
    Joined: Jul 2, 2003
    Posts: 6,579

    the-rodster
    Member

    Those are some ginormous valve covers.


    Very cool.

    Rich
     
  7. Devin
    Joined: Dec 28, 2004
    Posts: 2,352

    Devin
    Member
    from Napa, CA

    Wow! Those make arduns look commonplace. Thanks for sharing


    Posted using the Full Custom H.A.M.B. App!
     
  8. kyvetteman
    Joined: May 13, 2012
    Posts: 762

    kyvetteman
    Member

  9. Is it just me or do those videos have no sound? :(

    Edit: Nevermind, got it to work. Sounds gooooood! And looks even better.
     
  10. Mart
    Joined: Mar 3, 2001
    Posts: 3,749

    Mart
    Member

    I love it. hopefully it will get fitted into a car. Neat to see it run with the cover off. I never heard of that conversion before.

    Mart.
     
  11. Hot Rods Ta Hell
    Joined: Apr 20, 2008
    Posts: 3,934

    Hot Rods Ta Hell
    Member

    Very cool. That engine needs to be in a Hot Rod.

    From Youtube;
    This is 1 of 4 known to exist. Speedy Bill has one in the speedway museum. Made in Denver. Originally made in the 50's for the pikes peak hill climb. Mounted on a 59AB flathead ford.
     
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  12. flatheadkid1
    Joined: Jan 6, 2007
    Posts: 91

    flatheadkid1
    Member
    from OHIO

    Here is the car that ran Pikes Peak in the early 50's. They weighed too much and flowed too poorly to be really competitive despite the huge valves (1.813") and hemispherical design. They cost $750. That was in 1951, I believe.
    I have to check my facts but I believe the car that ran pikes peak sucked a valve. Not sure if it finished the race or not.
    The whole engine is 32" wide.
    The engine at the Speedway Museum is the only example of the few remaining that uses a 2X2 intake. The rest are 3X2.
    The valve covers in the pikes peak car were the only known examples of that design and have been lost to time.
    Speedways engine is shown for comparison. Speedway has the original patterns which can be seen behind the engine.
     

    Attached Files:

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  13. Zombie 51
    Joined: Feb 18, 2009
    Posts: 283

    Zombie 51
    Member
    from New York

    That thing looks like a BBQ. Its kind of beautiful and ugly at the same time.
     
  14. loudbang
    Joined: Jul 23, 2013
    Posts: 25,153

    loudbang
    Member

    Those LONG rocker arms on the bottom section look like they would have failed pretty quickly.
     
  15. flatheadkid1
    Joined: Jan 6, 2007
    Posts: 91

    flatheadkid1
    Member
    from OHIO

    They did break.
    Original Shephens piston is shown in the background.
    I'm not sure who owns the Stephens in the video but it looks great.
     

    Attached Files:

    Last edited: Feb 27, 2014
  16. thanx for reposting, missed this
     
  17. They don't appear to be any longer than those from an Ardun, although they definitely aren't as well designed.
     

    Attached Files:

  18. loudbang
    Joined: Jul 23, 2013
    Posts: 25,153

    loudbang
    Member

    For sure the Ardun ones look better designed. The Stephens just have a wide section in the center of the arm while the Ardun's have thicker material on the top and bottom where most of the forces would be directed.
     
  19. [​IMG][​IMG]

    Seen out a pinkee's before the good guys show in northern colorado

    Full Kustom, drunk mobile posting
     
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  20. Mart
    Joined: Mar 3, 2001
    Posts: 3,749

    Mart
    Member

    Great to see one in a car. Is that the same one as in the video? All that running on the test stand may have not done it much good.

    Mart.
     
  21. Jet96
    Joined: Dec 24, 2012
    Posts: 1,013

    Jet96
    ALLIANCE MEMBER
    from WY

    IMG_6828.jpg This ran at HRHC last year, sounded pretty healthy. I can't download the video...
     
  22. topher5150
    Joined: Feb 10, 2017
    Posts: 1,684

    topher5150
    Member

    what angle are those valves pointed at, they almost look sideways
     
  23. The motor in that video is in that 34 3w, Don Palmer, he attends the Hot Rod Hill Climb frequently. He got called out of town this year for work. It's one bad ass motor! Some where there is a video of it running up the hill at the Hot Rod Hill Climb.

    -nick
     
  24. The Lattens run one,,
    And I know of another set,,,,
     
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  25. The37Kid
    Joined: Apr 30, 2004
    Posts: 26,288

    The37Kid
    Member

    They sold for $750. new.

    Bob
     
  26. $um Fun
    Joined: Dec 13, 2008
    Posts: 500

    $um Fun
    Member
    from Nor Cal

    The one that Jim Latten runs are made by him. He has the patterns to them and had them on display at the LARS a few years ago.
     
  27. e1956v
    Joined: Sep 29, 2009
    Posts: 1,399

    e1956v
    Alliance Vendor

    20160409_115242.jpg 20160409_115228.jpg 20160409_115113.jpg
    Don hangs out on weekends at my buddy Charlie's garage. That's my grandson he loves Don's car.

    Sent from my SAMSUNG-SM-G890A using The H.A.M.B. mobile app
     
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  28. So the set I saw on a shelf are an original
     
  29. flatheadkid1
    Joined: Jan 6, 2007
    Posts: 91

    flatheadkid1
    Member
    from OHIO

    The intake and exhaust valves are at approximately 47.5 degrees and 40 degrees respectively.
    The engine in Lattin's Victoria is completely original and came from the Doug King collection.
    Many original parts existed which led Jim to make exact patterns for the heads themselves so the remaining original parts could be used. He cast the heads in aluminum as opposed to the original cast iron examples. To my knowledge only 3 pairs of aluminum heads were cast before the patterns were modified extensively for use on Jim's lakes car. The lakes car ran approximately 182 MPH. The patterns had to be modified because the original ports are poor.
     
  30. RichFox
    Joined: Dec 3, 2006
    Posts: 9,830

    RichFox
    ALLIANCE MEMBER

    Current rockers IMG_5394-vi.jpg
     
    Jet96, tubman and The37Kid like this.

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