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Discussion in 'Original Drivetrain Topic' started by Redliner, Feb 1, 2010.
What year did GM change to the second design lug nuts?
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 ????
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.
Thanks Chuck, and M21RSZ28 for the clarification. I will keep looking for a set, you never know when or where some might turn up.
I sold a handfull of those last weekend. Unfortunately that's all I had. I never liked them.
Just cleaning my garage, found my original lug nuts. Not pretty because they endured 100,000 plus miles.
Hard to find. Those look like the could be restored. For sale?
Thanks, but NFS. I have about three dozen different things that need re-chroming. Maybe next year is the ticket!
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!!
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.