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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.

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14y ago

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