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Flathead with an identity crisis?

Discussion in 'The Hokey Ass Message Board' started by wouterftw, Jan 10, 2014.

  1. wouterftw
    Joined: Aug 6, 2010
    Posts: 68

    wouterftw
    Member

    Hi,

    Two years ago I bought this '50 Shoebox from a guy in Miami and shipped it to the Netherlands. At the moment I'm tearing apart my flathead to check out what state it is in.

    When my car arrived one of the things I noticed was the fact that it had two different heads, one was an 8BA and the other an 8RT. Of course, there's not really a physical difference there, only the model of car it went into.

    But now we took the intake off and found this (see attachment). One of the springs is completely different, and I believe the retainer as well. The other retainers look more like the 1951 type (part 6517), right? As we don't have any other material to compare with, I'm turning to you guys! Thanks in advance!




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    Last edited: Jan 10, 2014
  2. wouterftw
    Joined: Aug 6, 2010
    Posts: 68

    wouterftw
    Member

    Here are the attachments:

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    Attached Files:

    Last edited: Jan 10, 2014
  3. wouterftw
    Joined: Aug 6, 2010
    Posts: 68

    wouterftw
    Member

    Anyone? The fact that I'm over in Europe makes it important that I order the right parts..
     
  4. Did you post over on ford barn?Some real knowledge there.
     
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  5. flathead4d
    Joined: Oct 24, 2005
    Posts: 875

    flathead4d
    Member

    The 8-RT head is a truck head. The difference in the valve keeper is in 1951 they changed over to a system that makes the valve rotate during use. The 49 and 50 valves don't rotate. You can use either one as long as it has the right spring. My guess would be they had some minor problem with the engine and use parts from different engine which will work but are not entirely correct.
     
  6. wouterftw
    Joined: Aug 6, 2010
    Posts: 68

    wouterftw
    Member

    Posted it over on the Ford Barn a few moments ago. Thanks!

    Thanks for the info! The reason I opened up the flathead was (what I thought) was a valve tick, and I'm thinking about changing some valvetrain parts. I was just wondering if someone recognizes these valve assemblies to be '51, so I know what I'm working with.

    Cool tudor btw!
     
  7. Looks to be different valve springs on some of the valves, too.
     
  8. Have you tried Mr Thedinga in Emmen ?
     
  9. wouterftw
    Joined: Aug 6, 2010
    Posts: 68

    wouterftw
    Member

    What does he do?


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  10. Old provincial Ford guru who still finds and sells parts.
     

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  11. J'st Wandering
    Joined: Jan 28, 2004
    Posts: 1,588

    J'st Wandering
    Member

    As you have found, two different styles of valve retainers and springs. Either style will work with a stock lift. The rotating style will have a shorter spring so keep the style of retainer matched up with the spring it came with.

    If you go with a different grind for the cam, you should go with the one without the rotator. That way the longer spring can be used allowing more lift.

    Again, as long as the styles stay paired up, either will work. The rotator was the new and improved version.

    I just did the valves on an engine build and tried to shim the stock springs with rotators to work with a 400 JR. cam. After shimming a bunch I got the seat pressure up but wasn't confident that I had enough lift left. I then switched to zephyr springs and no rotators.

    I hope it was o.k. to answer this over here rather than posting on the Ford Barn. ;)

    Neal
     
  12. cs39ford
    Joined: May 1, 2012
    Posts: 751

    cs39ford
    Member

    If this helps you can try this fellow in germany he does a lot of flathead rebuilds and parts http://oldhotrodparts.de/ A little closer to you Hope this helps
     
  13. wouterftw
    Joined: Aug 6, 2010
    Posts: 68

    wouterftw
    Member

    Thanks! I'll check him out sometime. It's not that I can't get a hold of the parts though, just wanted to know what I'm working with.

    Thanks for the info! Of course, it's okay to answer it here!

    I think I've got it figured out, my '50 flathead was swapped for a '51 once. Thanks all!


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  14. jdownunder
    Joined: Aug 21, 2007
    Posts: 334

    jdownunder
    Member

    i have an 8rt ,they are truck
    my dad just built up his 8ba for the 52 customline
    new valve seats were installed.when it was time to fire it up there was very little
    compression,turns out he had to buy adjustable valves as the stock ones have no
    adjustment the valve seat height is lower now after machining the old seats out
    j
     
  15. Russco
    Joined: Nov 27, 2005
    Posts: 4,064

    Russco
    Member
    from Central IL

    Lose the rotaters, just buy new Isky springs and retainers and keepers they are not that expensive. New guides while you are at it.
     
  16. Wouter, like Gaz34 say try Thedinga in Emmen, very friendly guy and friendly prices and he knows what he is talking about.

    Groeten Hennie
     
  17. J'st Wandering
    Joined: Jan 28, 2004
    Posts: 1,588

    J'st Wandering
    Member

    Watch what the pressure is on aftermarket springs. Isky used to have some that were way heavier than needed for a flathead. A stock spring will cover a lot of cams and the zephyrs will cover 99% of the rest.

    The seat pressure for the valve springs has been discussed before and what I took from it is many use too stiff of springs.

    Neal
     
  18. junkyardjeff
    Joined: Jul 23, 2005
    Posts: 7,062

    junkyardjeff
    Member

    When a valve job is done with original lifters the valve ends are supposed to be ground.
     
  19. jdownunder
    Joined: Aug 21, 2007
    Posts: 334

    jdownunder
    Member

    yeah we worked that out the hard way:eek:
     
  20. Russco
    Joined: Nov 27, 2005
    Posts: 4,064

    Russco
    Member
    from Central IL

    Yes, I should have been more specific. The 185-G springs are light enough for most street application cams.
     
  21. MN Falcon
    Joined: May 21, 2007
    Posts: 566

    MN Falcon
    Member

    Don't the 8RT heads have greater cc volume than the 8BA, something closer to the 8CM? This would mean the 2 heads have different compression ratios.
     

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