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F134 Exhaust Manifold

Discussion in 'Early CJ5 and CJ6 Tech' started by Don X, Jul 24, 2021.

  1. Don X

    Don X The Prodigal Moderator Staff Member 2023 Sponsor

    What is this spare bolt hole for?

    [​IMG]
     
    Don X, Jul 24, 2021
    #1
  2. PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor


    For the spare bolt. :shrug:
     
    PeteL, Jul 24, 2021
    #2
    Dandy and Jrobz23 like this.
  3. Hayden Basinger

    Hayden Basinger New Member

    Could it be a hold over from the L134 intake manifold?
     
    Hayden Basinger, Jul 24, 2021
    #3
    Rust Ranger likes this.
  4. 73 cj5

    73 cj5 Not ready for the junkyard yet

    Isn't that hole used on the L134 for the intake?
     
    73 cj5, Jul 24, 2021
    #4
  5. Glenn

    Glenn Kinda grumpy old man Staff Member

    Makes sense, must be L-head related.
     
    Glenn, Jul 24, 2021
    #5
  6. Don X

    Don X The Prodigal Moderator Staff Member 2023 Sponsor

    I can't specifically remember what were in the holes. All I had left were 2 studs. I think I'll use hex head bolts instead of the studs.

    [​IMG]

    [​IMG]
     
    Don X, Jul 24, 2021
    #6
  7. Glenn

    Glenn Kinda grumpy old man Staff Member

    I don't have anything in mine.
     
    Glenn, Jul 24, 2021
    #7
  8. Rick Whitson

    Rick Whitson Detroit Area 2024 Sponsor 2022 Sponsor

    My F Head has them, never noticed, Does not leak antifreeze. I assume like others said, must be left over from an L Head casting.
     
    Rick Whitson, Jul 26, 2021
    #8
  9. Oldpappy

    Oldpappy A.C. Fults - Curmudgeon at large 2022 Sponsor

    I don't think a left over from the L134 casting would explain the hole being drilled and tapped.

    Interesting to me that my 67 F Head does not seem to have the hole, unless it is filled in with crud and I couldn't see it. I have some pretty bad oil leaks from the rocker and valve covers. So I am about to pull those, adjust the valves and replace the gaskets. I will take a closer look when I clean it up for that work.

    Odd that they would tap holes that aren't used, as they would have benefitted from eliminating those steps in the manufacture.
     
    Oldpappy, Jul 26, 2021
    #9
  10. kenb

    kenb Cleverly disguised as a responsible adult

    Exhaust emissions control?
     
    kenb, Jul 26, 2021
    #10
  11. Glenn

    Glenn Kinda grumpy old man Staff Member

    My '60 has one at each end, tapped but not all the way into the inside of the block.
     
    Glenn, Jul 26, 2021
    #11
    Don X likes this.
  12. Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    I have them as well, if they're not L head leftovers then they seem remarkably well place to hold an L head intake manifold.

    Yes curious but they were still producing l heads up to the mid 60's at least, could be they just left them there because it was cheaper than setting up a separate boring operation for the F head, or at least that part of it.

    I do see the military version seems to have some sort of widget using the forward spot-


    upload_2021-7-26_20-33-7.png
     
    Last edited: Jul 26, 2021
    Howard Eisenhauer, Jul 26, 2021
    #12
    Don X and Glenn like this.
  13. Glenn

    Glenn Kinda grumpy old man Staff Member

    That might be a bracket holding the pcv line and associated fording valve for pressuring the crankcase for running in water. The lever is cable operated. Lever is that piece at an angle.
     
    Glenn, Jul 26, 2021
    #13