I not find reason why the eagle cast cranks (mopar , chevy, etc) are broken in the same place.

The car are a 3550 lb A-body.


'70 Dodge GTX sb 418ci (Early A-body),
Lunati Solid cam 270°/243°@.050/.548", Edelbrock Heads, Weiand X-CELerator,
Holley Terminator EFI, Tremec 6 sp manual, 3.90:1, TTI Headers.