[BigDogSS]

That is a carburetor heat shield. The heat shield will help to eliminate fuel boiling and vapor lock caused by heat conducted to the carburetor through the intake manifold. Unusual to see a heat shield for a 2-barrel carburetor.

 

[BigDogSS]

1C = The body build date tells the month and week the body was produced. 1 = January, C = 3rd week, 1963.

63 = Model year --> 1963

1847 = Body style --> Chevrolet Impala 2-door coupe

VN = Assembly plant --> Van Nuys, CA

875 = Interior code --> Red. Material type is: Vinyl (Impala SS coupe) Seat type: Bucket. This is what identifies this car as a true Super Sport. SS cars came with bucket seats ONLY. The standard Impala could NOT be ordered with bucket seats.

S = unknown

920 = Paint code --> Autumn Gold

E = (Accessory Group "1" is implied) --> Tinted glass

2 = Accessory Group "2"

C = Padded dash

M = Powerglide transmission

3 = Accessory Group "3"

Z = Poking around the internet found no consensus. Z could indicate --> Super Sport, or metallic brakes or tilt column

21 = unknown

 

[BigDogSS]

Way cool car!! Unusual combination with the Autumn Gold exterior and Red interior.

 

[BigDogSS]

I don't think they were widely used by the OEM. Most all of the ones I've seen are aftermarket. It looks like they did put them on higher horsepower Corvettes in the mid-60s. And some early 70s Chevelles with emissions.