Lug Nuts for Z-28 Five Spoke Wheel, 1971

Discussion in 'Original Drivetrain Topic' started by Redliner, Feb 1, 2010.

  1. greeny

    greeny Veteran Member

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    What year did GM change to the second design lug nuts?
     
  2. CamarosRus

    CamarosRus Veteran Member

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    I do not know year of change. It is so rare to see originals/survivors on
    a 70-74 Z. It will be difficult to get data.

    In looking through my library of pictures I found side by side comparison
    as photographed by expert M21RSZ28 (real name unknown to all)
    He captions his picture saying 75-81 was the 2nd design


    I'll write Bernie Watson and Eric Thompson about their 72's.

    I also copied email to M21RSZ28 who is usually best authority on part # revisions

    Trying to remember who currently owns the 74' survivor Z that was displayed at Camaro Nationals in 2013 ????
     
    Last edited: Aug 6, 2014
  3. M21RSZ28

    M21RSZ28 Veteran Member

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    1974 model year is when the shorter style #414188 stainless steel nut came in to production

    Per 1974 Camaro Assembly Manual and August 1973 (for 1974 Models) GM Parts Catalogs

    1969-73 used the longer style 399683 stainless steel nut as listed in:

    - 1969 1970 1971 GM parts catalogs

    - 1972 and 1973 Camaro assembly manuals.

    M21RSZ28
     
    Last edited: Aug 7, 2014
  4. greeny

    greeny Veteran Member

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    Thanks Chuck, and M21RSZ28 for the clarification. I will keep looking for a set, you never know when or where some might turn up.
     
  5. CamaroDoc

    CamaroDoc Veteran Member

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    I sold a handfull of those last weekend. Unfortunately that's all I had. I never liked them.
     
  6. FlaJunkie

    FlaJunkie Veteran Member Lifetime Gold Member

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    Just cleaning my garage, found my original lug nuts. Not pretty because they endured 100,000 plus miles.

    IMG_20191205_153822827.jpg
     
    Budz likes this.
  7. 70lt1z28

    70lt1z28 Veteran Member Gold Member

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    Hard to find. Those look like the could be restored. For sale?
     
  8. FlaJunkie

    FlaJunkie Veteran Member Lifetime Gold Member

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    Thanks, but NFS. I have about three dozen different things that need re-chroming. Maybe next year is the ticket!
     
  9. 72'z'steve

    72'z'steve Veteran Member

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    Just curious,did other manufacturers use those lug nuts too ,meaning were they sourced elsewhere? I fell down the rabbit hole on ebay and saw some NOS AMC capped nuts but were the short style.Thought maybe if others used these it would broaden the search area? just a thought Later Steve!!
     
  10. secondgenaddict

    secondgenaddict Veteran Member

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    The first note of the lug nut change is actually in the 1973 Camaro assembly manual - under the urethane -turbine wheel - notes a change of MARCH from the from the 399683 to 414188

    FWIW The Boss Mustangs and Shelby's used a 1/2 stud with the tall crown. Scott or Steve Fuller reproductions was reproducing them to EXACT specs...
    I have the original technical drawings and specifications from the first patent in 1966. I sent them to a couple of deep draw stamping plants but they were not interested -

    IMHO it's liability, the design changed from a crimp on to a actual resistance welding to ensure the caps would not come off - there is a patent for the resistance welded capped nut as well from the early 70's. US3364806-0.png
     

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