What engines are in Chevy Impala?
The Chevrolet Impala has used a wide variety of engines over its long history. In its latest—and final—U.S. version, it offered two powertrains: a 2.5-liter inline-four and a 3.6-liter V6. Across the decades, the Impala’s lineup ranged from classic small-block and big-block V8s to modern six- and four-cylinder options.
Classic and performance era (1958–1970)
During the early decades, the Impala was offered with multiple V8 configurations, reflecting Chevrolet’s focus on rear-drive performance and highway cruising. The engine options spanned both small-block and big-block V8 families, with some high-performance SS models receiving larger displacement powertrains.
- Small-block V8 family (early Impalas): lightweight, versatile V8s such as the 283- and 327- or 350-cubic-inch variants.
- Big-block V8 family (performance-focused years): engines like the 409, 427, and later large-displacement are associated with the Impala SS lineage.
These engines powered the Impala through an era defined by highway cruising and straight-line speed, with high-performance SS versions standing out for their brute powerplants.
Late 1990s to mid-2000s: V6 and V8 options
In the late 20th and early 21st centuries, the Impala shifted toward more modern V6 configurations for everyday practicality, while still offering V8s in higher-performance trims.
- 5.7-liter V8 (LT1) used in the performance-oriented Impala SS produced in the mid-1990s.
- 3.8-liter V6 (the 3800 Series II) used in mainstream Impalas and police-era variants for a balance of power and efficiency.
These choices reflected a move toward more refined, smoother powertrains while preserving the Impala’s reputation for comfort and capability.
Modern era (2014–2020): two current engines
The final generation of the Impala offered a straightforward powertrain choice focused on efficiency and presence, with one conventional V6 option and a new four-cylinder for better fuel economy.
- 2.5-liter inline-four EcoTec engine (efficient base option) designed for better fuel economy in everyday driving.
- 3.6-liter V6 engine delivering stronger performance and refined highway manners for buyers seeking more power.
Chevrolet positioned these two engines to provide a practical balance of comfort, performance, and efficiency, culminating in the model’s retirement in 2020 after a long run.
Summary
Across its history, the Impala has seen a broad engine spectrum—from early small-block and big-block V8s to modern V6 and four-cylinder setups. The final generation offered two engines, but the nameplate’s legacy includes iconic high-displacement V8s and performance-oriented variants that defined several eras of American full-size cruising.
