The spider webbing cracks were in the frame emanating from the weld point. I’m sure they were from fatigue. The constant twisting of the frame, and as it proved, was not properly braced, thus the need for the braces late in production and in 65. I have no proof that the frames are heat treated, but I suspect they are. Stiffer frame with a lighter weight. I know that steel rims in the 50s were much softer than the steel rims in the 60s, and I believe they were either heat treated or a stiffer alloy. You can definitely tell the difference between my 55 Chevy steel wheels and mid 60s GM steel wheels. The 50s wheels are much more prone to deformation and damage.
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If someone else can design it, I can sure figure out how to fix it.
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