Though not called Corvette, the curvy 
one-off Astro II of 1968 fueled rumors 
that a mid-engine Chevy sports car was 
near. 
Developed as GM project XP-880, it was 
a follow-up to the previous year's 
Corvair-based Astro I, but carried a 
Corvette V-8 and conventional doors. 
The entire rear half of the body was 
hinged to tilt up for engine access. 
  