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Hole in Firewall not identified

Body Shop

  1. 71droptop

    71droptop Well-Known Member

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    Hey hi- that might be the reverse back up light ( on the dash- 4 spd cars).
    Tach wire goes right thru firewall to coil.
    Thanks for the reply.
     
  2. ZippyZoo

    ZippyZoo New Member

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    IMG_1934.JPG
    My '71 vert also has a clamp mounted at the mystery hole!
    I'm new to FEBO - great information and sharing. Thanks
     
  3. doubleyellow

    doubleyellow Well-Known Member

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    Thanks for sharing the pic Zip......looks like the hole in mine was a later 1970 model year addition.....running the windshield fluid hose and regulator wiring? Plus what else is going through that wire clip?
     
  4. ZippyZoo

    ZippyZoo New Member

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    Doubleyellow - I went back to pictures I took in 1987 (original) before the first "rust-oration" and engine swap. Best I can tell, as you said, the washer hose plus two harnesses: 1) feeding the ballast resistor/coil/distributor and 2) the regulator one running along the right side valve cover up to the alternator (and, I think, the horns). At least one of the harnesses has a rectangular plastic loop attached which hooks onto the firewall clip. Challenger vert was built in OCT70 - 318 engine.
    Firewall clip 1.jpg
     
  5. aussiemark

    aussiemark Well-Known Member

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    My Challenger was built in April 70 and doesn't have the hole so it must have been in cars built after this.
     
  6. Grady Cain

    Grady Cain Well-Known Member

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    This is all great stuff! By comparing information and photos from known original cars, this is how we really learn the finer details about what Ma Mopar did (or didn't do) on the assembly line. This is the signature of a true enthusiasts' forum - members helping members with a small but important detail like a tiny hole in the firewall. I am pleased to see all of the responses and kudos to the OP for inquiring so he can get his restoration correct. Mopar passion man - love it...
     
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  7. doubleyellow

    doubleyellow Well-Known Member

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    Splitting hairs here, but mine was built April 27, 1970 - so late in April.......aussiemark what day in April for yours?
     
  8. aussiemark

    aussiemark Well-Known Member

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    It has 4-70 on the door sticker, I do have the build sheet how can I tell?
     
  9. doubleyellow

    doubleyellow Well-Known Member

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    I went by my fender tag......second row from the bottom........second number from the right......mine is "427", so April 27.
     
  10. aussiemark

    aussiemark Well-Known Member

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    Another thing is mine is a sunroof car so maybe there was a delay because the car was sent to the ASC to have the sunroof fitted so the body shell could be older then the date on the sticker.
     
  11. Grady Cain

    Grady Cain Well-Known Member

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    How do you know it was actually built on April 27th? The date stamped on the fender tag is the scheduled production date and not necessarily the actual build date. My A12 Super Bee has 426 (April 26) as the SPD but documentation of several cars with VINs surrounding mine places my car as actually built around May 20th.
     
  12. doubleyellow

    doubleyellow Well-Known Member

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    I did not know that......so is there any documentation or marking on the car that is the closest to the "actual" build date (unfortunately my build sheet and door sticker are long gone)
     
  13. aussiemark

    aussiemark Well-Known Member

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    I decoded the build sheet and it was scheduled to be built on the 5th day of March but I will check the numbers on the fender tag and let you know what they are.
     
  14. Grady Cain

    Grady Cain Well-Known Member

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    The SPD on your fender tag will be the same as the date listed at the beginning of the "Vehicle Order Number" section on your build sheet. Again, this is just the date the car was released to be assembled and not necessarily the actual assembly date.
     
  15. aussiemark

    aussiemark Well-Known Member

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    On the fender tag second row from the bottom, second numbers from the right is 309. On the build sheet the first numbers for the vehicle order number are 305, the warranty papers have a delivery date 5/15/70
     
    Last edited: Mar 9, 2019
  16. DetMatt1

    DetMatt1 Well-Known Member

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    The number stamped on the front of your original engine crossmember is the date the engine was mounted to it.
     
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  17. doubleyellow

    doubleyellow Well-Known Member

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    Thanks Matt, I'll check for that
     
  18. doubleyellow

    doubleyellow Well-Known Member

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    Follow-Up to this.....I pulled out my old harness and did find the wire harness that goes in the firewall, but also note there are 2 additional clips wound into the harness wrapping........eventually need to find out exactly where the clips were located in the harness (most of the wrapping shredded off so ca't tell the exact spot)

    Should have looked at my old harness originally, but it was interesting seeing the differences between the e-bodies Harness 2.jpg Harness.jpg just within a few months in 1970.
     
  19. aussiemark

    aussiemark Well-Known Member

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    We are very close to knowing the date they started doing the extra hole, is the hole on the 1971 models?
     
  20. AUSTA

    AUSTA Well-Known Member

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    Could have been an update on later models to keep the wiring away from the HV distributor wires