1973
Example: 1Z37Z3S123456
1 - Division Code (1=Chevrolet)
2 - Series (Z=Corvette)
3-4 - Body Type (37=Coupe, two-door hardtop, 67=Coupe, two-door convertible)
5 - Engine Code (J=350ci/190hp, T=350ci/250hp, Z=454ci/275hp)
6 - Last Digit of Model Year (3=1973)
7 - Plant Code (S=St. Louis, Missouri)
8-13 - Sequential Production Number (Starts at 400001 through 434464)

1974
Example: 1Z37J4S123456
1 - Division (Make) (1=Chevrolet)
2 - Car Line/Series (Z=Corvette)
3-4 - Body Type (37=Coupe, two-door hardtop, 67=Coupe, two-door convertible)
5 - Engine (J=350ci/195hp, T=350ci/250hp, Z=454ci/270hp)
6 - Model Year (4=1974)
7 - Assembly Plant (S=St. Louis, Missouri)
8-13 - Production Sequence Number (Starts at 400001 through 437502)

1975
Example: 1Z37J5S123456
1 - Division (Make) (1=Chevrolet)
2 - Car Line/Series (Z=Corvette)
3-4 - Body Type (37=Coupe, two door hardtop, 67=Coupe, two-door convertible)
5 - Engine (J=350ci/190hp, T=350ci/205hp)
6 - Model Year (5=1975)
7 - Assembly Plant (S=St. Louis, Missouri)
8-13 - Production Sequence Number (Starts at 400001 through 438465)

1976
Example: 1Z37L6S123456
1 - Division (Make) (1=Chevrolet)
2 - Car Line/Series (Z=Corvette)
3-4 - Body Type (37=Coupe, two-door hardtop)
5 - Engine (L=350ci/180hp, X=350ci/210hp)
6 - Model Year (6=1976)
7 - Assembly Plant (S=St. Louis, Missouri)
8-13 - Production Sequence Number (Starts at 400001 through 446558)

1977
Example: 1Z37L7S123456
1 - Division Code (1=Chevrolet)
2 - Series (Z=Corvette)
3-4 - Body Type (37=Coupe, two door hardtop)
5 - Engine Code (L=350ci/180hp, X=350ci/210hp)
6 - Last Digit of Model Year (7=1977)
7 - Plant Code (S=St. Louis, Missouri)
8-13 - Production Sequence Number (Starts at 400001 through 449213)