Chevrolet’s own factory-fastest Corvette made 650 horsepower and already felt like it was testing the limits of a street car. Then a tuner took the lesser Grand Sport, stroked it from 6.2 to 6.8 liters, bolted on a supercharger and reached roughly 800 horsepower and 750 lb-ft, wearing a badge that has been frightening Chevrolet rivals since the 1960s. Only a small number were ever built. Read on for what the Yenko/SC package actually changes and where that name came from.