When you look at a modern Chevy engine, that’s not what you’re really seeing. Instead, it’s a GM “corporate” engine that is used across all the various brands (at least those that are still with us). But back in the day that wasn’t the case. In the golden era of muscle cars, GM divisions (Oldsmobile, Buick, Pontiac, and Chevrolet) had a lot of freedom to develop their own unique drivetrains, helping fuel the horsepower wars of the late ’60s and early ’70s. For example, Olds, Pontiac, and Buick all had 455-inch big-block V8s, but aside from the displacement, they had very little in common. Duplication of effort? Waste of company resources? Yeah, you could argue that. But it also led to innovation.
It was 1968 when Oldsmobile unveiled the Rocket…