4.8L Engine Vs. 350 Engineby Justin Cupler
In 1999, Chevrolet began phasing out the C/K-series of pickup trucks and bringing in the Silverado pickups. With that change came the elimination of the 350, also called the 5.7-liter, and the addition of the 4.8-liter. As of the 2011 model year, the 4.8-liter is still in use.
Both the 4.8-liter and the 5.7-liter are V-8 engines, with 16 valves in an overhead-valve configuration. Both engines are powered by gasoline and use sequential electronic fuel injection.
The 4.8-liter has a 3.78-inch bore, a 3.27-inch stroke and an 8.8-to-1 compression ratio. The 5.7-liter has a 4-inch bore, 3.48-inch stroke and a 9.4-to-1 compression ratio.
The 4.8-liter is rated at 13 to 14 mpg in the city and 18 to 19 mpg on the highway, when fitted in the 2011 Silverado 1500. The 5.7-liter is rated 13 to 14 mpg in the city and 17 to 18 mpg on the highway, when fitted in the 1999 C/K1500.
The output of an engine is measured by its horsepower and torque rating. The 4.8-liter engine produces 302 horsepower at 5,600 rpm and 305 foot-pounds of torque at 4,600 rpm. The 350-cubic-inch engine produces 255 horsepower at 4,600 rpm and 330 foot-pounds of torque at 2,800 rpm.