Chevrolet Silverado 1999-2006: 5.3L vs. 5.7L V8 Engine Differences Chevrolet offered the 5.7 liter vortec engine in some of its 1999 C1500 pickups. During 1999 the 5.7 was phased out and GM introduced the 5.3 liter. The reasoning for this transition was to improve on the 1500's fuel economy and reduce its emissions output. Many are happy with the 5.3 liters performance...