It was a styling cue. Back then, people used to take all the chrome, and trim off of their cars. These were called "shaved". Without the gas door, on the rear quarter, it gives the panel a smoother look, which is what people wanted. They did the same thing on the 57. Also, back then, they were into the anti theft thing. That is when the numbers matching thing came about. (The engine ID numbers match the vin numbers, making it easier to trace a stolen vehicle) and if no one nows where the gas inlet is, then they cannot siphon your gas. These are two eductated guesses. To the best of my knowledge, Chevy has never openly commented on this.
Behind the tail light on the driver's side. That's on a '56. The center section of the the tailfin chrome on the driver's side swings out and the gas cap is there on a '57.
The fuel filler is located behind the left rear taillight. Right above the large red taillight lens you will see a vertical piece of chrome. Grasp that vertical piece of chrome and turn it counterclockwise. The taillight lens assembly will them drop down to reveal the gas cap.
The most similar vehicle, ironicaly, would be the 55, Chevy.
From inside the trunk.
Design engineers.
will a 1956 gmc 3 speed trans bolt on a chevy 350 v-8 engine
Chevy 265, 1955 -56. Want to sell it?
56 oz of R134a
Rwanda has 56 billion cubic meters of gas reserve.
56
You have to remove the inside panel, where the window crank is, or would be.
Under the dash, against the firewall, all the way to the left.