The most current generation has different engines with different liters and horsepower depending on the year/model you have. They have 211-303 horsepower engines, and the 2006 Impala model was 3.5 liters. The newer Impalas (Including 2013 models) have 5.3 liter engines.
The 2002 Chevrolet Impala has a V6 engine.
The 2011 Chevrolet Impala has a V6 engine.
The 2010 Chevrolet Impala has a V6 engine.
The 2007 Chevrolet Impala has a V6 engine.
The 2008 Chevrolet Impala has a V6 engine.
The 2004 Chevrolet Impala has a V6 engine.
The 2009 Chevrolet Impala has a V6 engine.
The 2006 Chevrolet Impala has a V6 engine.
The 2001 Chevrolet Impala has a V6 engine.
The 2005 Chevrolet Impala has a V6 engine.
The 2013 Chevrolet Impala has a V6 engine.
The 2012 Chevrolet Impala has a V6 engine.