The 2006 Chevrolet Impala has 12 valves.
The 2001 Chevrolet Impala has 12 valves.
The 2007 Chevrolet Impala has 12 valves.
The 2011 Chevrolet Impala has 12 valves.
The 2002 Chevrolet Impala has 12 valves.
The 2004 Chevrolet Impala has 12 valves.
The 2014 Chevrolet Impala has 16 valves.
The 2010 Chevrolet Impala has 12 valves.
The 2003 Chevrolet Impala has 12 valves.
The 2008 Chevrolet Impala has 12 valves.
The 2005 Chevrolet Impala has 12 valves.
The 2009 Chevrolet Impala has 12 valves.