Brake Drum Spring
It may be the shape, thickness, or alloy of the drum. I have seen them on other cars, but don't ask me "which". IT HAS BEEN a very long time LOLOL
Turns out Corvair used them............
Spring around the outside of the drum.
C2 Corvettes..........
Purpose of Springs AROUND Brake Drums - CorvetteForum - Chevrolet Corvette Forum Discussion
Ponch GTO..............
Mastering GTO Restorations: Brake Guide
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