Register now to get rid of these ads!

Featured Projects I'm 18 and building my first flathead 8cm (or 59 L) putting it in a traditional hotrod that is tbd

Discussion in 'Traditional Hot Rods' started by Jesse Borba, Nov 20, 2020.

  1. Jesse Borba
    Joined: Nov 20, 2020
    Posts: 83

    Jesse Borba
    Member

    Hi I'm Jesse I'm 18 and picked up a 8ba merc flatty for $100 last week for my birthday and thought that it would be cool to document the disassembly and rebuilding of the motor to learn the hamb better. I'm always looking to learn and any advice or knowledge would be much appreciated
     
  2. adam401
    Joined: Dec 27, 2007
    Posts: 2,281

    adam401
    ALLIANCE MEMBER

    Thats great Jesse. Lotsa love for flatheads on this forum. I'll be looking forward to pictures of your new engine. Good luck!
     
    Jacob Foster likes this.
  3. Jesse Borba
    Joined: Nov 20, 2020
    Posts: 83

    Jesse Borba
    Member

    16059110592911413721550519841851.jpg 16059111090626788232923338629270.jpg 1605911176802594318569546998084.jpg It's pretty crusty in the intake ports
     
  4. Jesse Borba
    Joined: Nov 20, 2020
    Posts: 83

    Jesse Borba
    Member

    Thank you!
     
    chryslerfan55 and dana barlow like this.

  5. triumph 1
    Joined: Feb 9, 2011
    Posts: 534

    triumph 1
    Member

    Welcome to the H.A.M.B. Jesse!
    Nice score for $100.



    Sent from my iPhone using H.A.M.B.
     
  6. arkiehotrods
    Joined: Mar 9, 2006
    Posts: 6,034

    arkiehotrods
    Member

  7. Jesse Borba
    Joined: Nov 20, 2020
    Posts: 83

    Jesse Borba
    Member

    Thank you for the info I probably should've guessed that from the 8CM on the heads lol
     
  8. Fortunateson
    Joined: Apr 30, 2012
    Posts: 3,549

    Fortunateson
    Member

    Heads can easily be swapped for those in desperate need of a HP " increase". Check for the throw of the crank out the elongated dimple on the crank.
     
    Last edited: Nov 22, 2020
  9. nochop
    Joined: Nov 13, 2005
    Posts: 1,837

    nochop
    Member
    from norcal

    Welcome young ‘un
     
    Jesse Borba likes this.
  10. sloppy jalopies
    Joined: Jun 29, 2015
    Posts: 4,374

    sloppy jalopies
    Member

    welcome, the timing gear housing has a small indent near the base of the shaft... pilot...
    if stock that is a 1949 only...
     
    wheeldog57 likes this.
  11. Jesse Borba
    Joined: Nov 20, 2020
    Posts: 83

    Jesse Borba
    Member

    Thank you that's super useful I'm 90% sure it's stock
     
  12. 51504bat
    Joined: May 22, 2010
    Posts: 2,350

    51504bat
    ALLIANCE MEMBER

    Just because it has Merc heads means nothing. Don't ask me how I know. If it has a Ford 3 3/4" crank the Merc heads will lower the compression. If you want to run stock heads find a set of EAB heads whether or not you have a Merc crank.
     
    Boden and chryslerfan55 like this.
  13. 51504bat
    Joined: May 22, 2010
    Posts: 2,350

    51504bat
    ALLIANCE MEMBER

    '49 Merc would have had wide belt pulleys. From what I can see in the photos the pumps are narrow belt but its hard to tell and pumps could have been changed over the years. Did it come with a bell housing? If it has a 1/2 bell sheet metal housing that's another indication of Merc but not a guarantee. Pull a head and measure the stroke. Then you'll know for sure.
     
    chryslerfan55 likes this.
  14. Jesse Borba
    Joined: Nov 20, 2020
    Posts: 83

    Jesse Borba
    Member

    I measured the depth the piston is in the motor and it is 4" is that enough information to tell?
     
  15. Flathead Dave
    Joined: Mar 21, 2014
    Posts: 3,070

    Flathead Dave
    ALLIANCE MEMBER
    from So. Cal.

    Be sure to check all of the decks for cracks. Flatheads came with a national stock number for the cracks.

    Sent from my SM-G973U using The H.A.M.B. mobile app
     
    rkkoehler, loudbang and Jesse Borba like this.
  16. yea sounds like ya 4" crank in her thats worth 250 alone good score.
    Take your time on disassembly and if no cracks you got yourself a real deal. What are your plans for it???
     
    chryslerfan55, rkkoehler and loudbang like this.
  17. Jesse Borba
    Joined: Nov 20, 2020
    Posts: 83

    Jesse Borba
    Member

    I want to do everything besides the machine work myself and put it in a traditional hotrod which might end up being a 1934 ford 4 door sedan that was chopped in the 50s that I picked up for $700
     
    Pinstriper40, Tall t 26, Tim and 8 others like this.
  18. Fortunateson
    Joined: Apr 30, 2012
    Posts: 3,549

    Fortunateson
    Member

    Bugger, you're really finding the deals! Way to go...
     
    Last edited: Nov 28, 2020
    Stogy likes this.
  19. Jesse Borba
    Joined: Nov 20, 2020
    Posts: 83

    Jesse Borba
    Member

    It's rough in the floor pans but the doors all close perfectly so it definitely would be a candidate for this motor eventually
     
  20. Jesse Borba
    Joined: Nov 20, 2020
    Posts: 83

    Jesse Borba
    Member

    The read two cylinders seem the roughest but it seems that there is no major pitting from what I can see and feel I'm going to try to get the oil pan pull tonight but it might carry over to tomorrow 16059224436656640272720227011351.jpg 16059225685728207328451211513478.jpg
     
    kidcampbell71, brEad, Tim and 5 others like this.
  21. joel
    Joined: Oct 10, 2009
    Posts: 1,777

    joel
    ALLIANCE MEMBER

    I'll follow along.
     
    Jesse Borba likes this.
  22. tubman
    Joined: May 16, 2007
    Posts: 5,326

    tubman
    ALLIANCE MEMBER

    Hmmm. I enlarged the picture and don't see even the "part number" cracks. You may have gotten lucky.

    I wish you more luck with this.
     
    Stogy and arkiehotrods like this.
  23. Jesse Borba
    Joined: Nov 20, 2020
    Posts: 83

    Jesse Borba
    Member

    Thank you for the good luck lol. I couldn't see any cracks either.
     
  24. brady1929
    Joined: Sep 30, 2006
    Posts: 8,444

    brady1929
    Member

    You may have to have it magnafluxed at the machine shop. Cracks may not be visible to the naked eye. Good luck and welcome.
     
    Stogy, Flathead Dave and Jesse Borba like this.
  25. tubman
    Joined: May 16, 2007
    Posts: 5,326

    tubman
    ALLIANCE MEMBER

    Just so you know, "part number cracks" are the cracks between the middle head bolt hole and the water passage just below it between the #1 and #2 cylinders and #3 and #4 cylinders. They are considered to be harmless and are common in a lot of flathead blocks. I have found that if you get a block without them, it is practically guaranteed to be good. (Maybe I have just been lucky.) They are called "part number cracks" because they are so common that a few wags have suggested that they should have been assigned a "part number" by Ford.

    In addition to having the block magna-fluxed, it should be pressure tested, which a lot of folks will say that will detect internal hidden cracks better than magna-fluxing.
     
    getow, Hnstray, Stogy and 4 others like this.
  26. Welcome and good luck !
     
    kidcampbell71 and Jesse Borba like this.
  27. 51504bat
    Joined: May 22, 2010
    Posts: 2,350

    51504bat
    ALLIANCE MEMBER

    Depending on how much of an over bore you plan on (if any) you might want to consider sonic testing the block in addition to the magniflux and pressure test. The machinist that did the work on my 8ba said based on his experience (extensive) and the mag test he didn't feel a pressure test was necessary. 10k on the rebuild and no issues so he was right
     
    chryslerfan55 and Jesse Borba like this.

  28. Hi Jesse,
    Before you get too far along in your teardown, search "Mart" on here and check out his videos. He's resurrected a few flatheads, and has some good tips. His videos also show some problems and "oops" he's run into, along with hints on avoiding or worsening damage. He's a good narrator and time spent viewing his videos would be time well spent (and maybe less money spent). Good luck!
     
    Hnstray, brEad, Tim and 4 others like this.
  29. tubman
    Joined: May 16, 2007
    Posts: 5,326

    tubman
    ALLIANCE MEMBER

    Hmm. In my experience, 1/8" (.125") overbore in an 8BA has never been a problem (and the pistons are the same price); Ford had the "core-shift" problem under control by then. I also believe that skipping the pressure test would be a mistake.

    I also recommend "Mart"'s videos; the guy is a "practical" treasure. In the same vein, you might want to try "The Ford Barn"; website where things are a little more "flathead focused".
     
    Stogy, chryslerfan55 and Jesse Borba like this.
  30. Jesse Borba
    Joined: Nov 20, 2020
    Posts: 83

    Jesse Borba
    Member

    Thank you guys so much for all the advice I'll check all this stuff out tonight before I go to bed
     
    Stogy, chryslerfan55 and arkiehotrods like this.

Share This Page

Register now to get rid of these ads!

Archive

Copyright © 1995-2020 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.