The Chevy 454 SS truck derives its name from its engine, which is the 454. The 454 refers to the engine's displacement, which is 454 cubic inches, with sufficient volume to hold approximately 7.4 liters of fluid.
Chevy's 454 SS, or Super Sport, was a half-ton, regular cab pickup with two-wheel-drive released in 1990. It was a streamlined and sporty pickup, as its name suggests, with a red cloth interior for the Silverado trim, tall-back bucket seats that reclined, a sliding rear window, power locks and air conditioning. The modest in-dash entertainment featured a cassette deck with graphic equalizer.
With its compact size and capable engine, the 454 SS's maneuverability was unusually smooth for a truck. In 1991, Chevy released a more polished 454 SS. It had an in-dash tachometer, and its lowered rear-axle ratio improved its performance and economy.
In 1991, Chevy tweaked the 454 SS's engine, which was originally a new edition to Chevy's family of economical big-block crate V8 engines. An earlier version powered the iconic Corvette up until 1974. The 1990 454 delivered 230 horsepower and 385 pound/feet of torque at 1,600 rpm. The transmission was three-speed, and the combined effect allowed the 454 SS to rip from zero to 60 in roughly eight seconds.
The year 1991 also found the 454 SS's three-speed transmission transformed into a four-speed electronic automatic transmission. The upgrade added 25 additional horsepower and a torque of 405 pound/feet at 2,400 rpm.