I'd bet the seam was filled with body filler, and the heat cycles and natural flexing of the vehicle caused it to split.
Usually if I'm filling those seams, I'll weld them together and grind it all smooth.
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"Those poor souls have made the fatal mistake of surrounding us. Now we can fire in any direction"
1970 Trans Am RAIII 4 speed
1971 Trans Am 5.3 LM7
1977 Trans Am W72 Y82
1987 Grand National
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