GM cubic inch limitations

[Late BrakeU2]

I know prior to 1970 GM had a restriction stating no mid size car engine could have a displacement larger than 400 c.i.(hello COPO)but that was dropped the following year.A marketing standpoint and insurance are the only plausible reasons-Camaros and Novas were entry level where as the Impala,Chevelle,Monte,(Firebird,GTO,Buicks) targeted the "older" buying influence who were much less affected by insurance due to age.On a side note I think that's why so many more of the latter have more docs-the people that bought them were generally older and knew the importance of keeping records jmo

[Keith Tedford]

GM had plans for the 454 in the Camaro. The parts books were printed up for it. Insurance was one of the big reasons I would think. No insurance. No car. Pretty basic. People who could afford a Corvette could also afford the 454 and the insurance. If people wanted a 454 and couldn't get it in a Camaro, they would buy a Chevelle. I believe the Chevelle was cheaper to insure back then as well. GM would already know that this was the last year for the hipo cars so that may have had something to do with the call as well.