Mark W.
Nut house of the Universe
Mark, were the frames from the same make, model and year cars? 12lb difference can not be all attributed to rust, can it?
Yes both frames were from 1966 Chevelle Malibus the lighter frame came from a 4 door. But with the two frames laying next to each other on the shop floor they looked identical save for the two door frame having a bend rear cross member.
In 1966 all 4 models 300 post 2 door 300 4 door Malibu and Super Sport all used the same frame. The convertable has doubling rails on the main side sections. Wiether Malibu or Super Sport.