Like yeah sure it’s impressive that the C8 Z06 makes 670 horsepower from a 5.5L V8, but how about the 1974-1976 Cadillac DeVille making 190 horsepower from an 8.2L V8?
https://www.ultimatespecs.com/car-specs/Cadillac/29057/Cadillac-DeVille-IV-Coupe-82-V8.html
For comparison, in 1934 Chevy offered a 3.4L I6 with 80 horsepower, the same efficiency as that massive big block from 40 years later.
https://en.wikipedia.org/wiki/Chevrolet_Stovebolt_engine
The interesting thing is how they managed to squeeze so little power out of such massive displacement.
Driving-wise, they suck. All the power of a Volkswagen 4-pot with none of the eagerness to rev. Plus, they must have come from the factory with an oil refinery, otherwise I don’t know how anyone was able to afford to fuel them.