What years were the Chevrolet vortec engines made?

The Vortec engine series from Chevrolet wasn't produced during a single, continuous span of years. Instead, different Vortec engines were introduced and discontinued at various times throughout the late 1990s and 2000s. Therefore, there's no single "start" and "end" year. To get a precise answer, you'd need to specify *which* Vortec engine you're interested in (e.g., 4.3L, 4.8L, 5.3L, 5.7L, 6.0L etc.), as their production years varied.