Is Impala a V6 or v4?

The Chevrolet Impala is typically available with either a V6 or a V8 engine, not a V4.  

While V4 engines do exist,

they are less common in larger vehicles like the Impala.

The V6 engine offers a balance of performance and fuel efficiency,

while the V8 engine provides more power and performance.

The specific engine options available for the Impala can vary depending on the model year and trim level,

but V6 and V8 engines are the more common choices for this vehicle.