The fourth-generation Impala of 1965 to 1970 dropped the X frame for a full-width perimeter frame. Pillarless models gained curved, frameless side glass. Chevrolet dropped the Super Sport series after 1969, though a big-block V8 was still available for 1970, with the 454 replacing the 427. This particular example is a 1970 Impala coupe in Fathom Blue, lowered.