Answer to the question you didn't ask
It wasn't until the C4/C5 that the Generation tags were applied by GM. The Gen names were assigned by GM and almost completely illogically.
C1 = 1953-1962 Why? The cove first appeared in 1956 and everything around it was new including roll-up windows et. al. Why wasn't the '56 the start of the C2?
The C1 includes 6cyl and V8s. Autos and manuals. However, all were on the same chassis with many improvements over the 10 years.
C2 = 1963-1967 A completely new design on a completely new chassis but initially using a holdover 327 V8 engine with some improvements.
C3 = 1968-1982 A completely new body (remember the '56 was a completely new body, but not a "Gen") on the same chassis
as the 63-67 C2 initially with almost no changes. The C3 received several body updates both to meet legislated safety requirements and for marketing reasons. The '78 is almost as different looking to the '68 as the '56 is from the '53. Some chassis improvements also appeared during the C3 run.
C4 = 1984-1996 A completely new body and chassis with a holdover engine the first year. The C4 subsequently received 2 completely new engine generations during its run. It also received a mid-gen "update" to the fascias and body. The ZR-1 was introduced with a wide body and DOHC V8 engine.
C5 = 1997-2004 A completely new body on a completely new chassis with a completely new engine. During the C5 gen the base engine received a minor update and the Z06 model was introduced with substantial performance upgrades but used the same block and architecture as the base engine.
C6 = 2005-2013 A completely new body with much of the same C5 chassis but increased rigidity significantly while REDUCING weight. Engines were new, but evolutionary from the C5. Other than fasteners and later some brakes, there are no interchangeable parts between the C5 and the C6. High-performance models and engines were added with minor changes in the body.
C7 = 2014-2020 A completely new body on a completely new chassis with a completely new engine. Minor changes in the body.
Logic would have, at LEAST, added a gen for the '56-'62 that would ignore the change to quad headlights and the Sting Ray tail in '61.
If you use 'chassis' as the generation determinator, the C2 & C3 would be together in the same generation. Obviously, using
the engines to as the determinator would put the C7 at C9 or something like that.
Therefore, Corvette belongs to GM and THEY can arbitrarily assign generation numbers the way they choose.