A car produced by Chevrolet from 1964-1977. The most desired years are from 1964 to 1972, with the first performance package being the 1965 Chevrolet Chevelle SS 396 L78 coupe with the 396 Cubic Inch 4-Barrel Carburetor making 325 Horsepower as base, but with the optional 375 Horsepower version being available. If you don't count the SS 396 L78 coupe being the first performance package, there was the 250 Horsepower to 350 Horsepower 327 Cubic Inch 2/4-Barrel Carburetor V8 as an RPO Package (that made up to 350 Horsepower) L79.
The most powerful would eventually be the 1970 Chevrolet Chevelle SS 454 LS6 making 450 Horsepower and 500 Foot Pounds Of Torque. However, actual estimates put the Horsepower Count at around 500 Horsepower and Torque Count at around 550-570 Foot Pounds of Torque.
It would eventually decline after 1973, just like most American cars due to the 1973 Oil Embargo/Crisis, which was VERY unfortunate. However, it would truly decline in the 1990s-2000s.
Car Enthusiast 1: "What was the most powerful Chevelle?"
Matthew Paano Torres: "1970 Chevrolet Chevelle SS 454 LS6. Made 450 Horsepower, but damn Chevrolet people lied and it actually made Five Hundo!"