The 2012 Chevrolet Impala has double overhead cam (DOHC).
The 2014 Chevrolet Impala has double overhead cam (DOHC).
The 2013 Chevrolet Impala has double overhead cam (DOHC).
The 2010 Chevrolet Impala has overhead valves (OHV).
The 2006 Chevrolet Impala has overhead valves (OHV).
The 2008 Chevrolet Impala has overhead valves (OHV).
The 2011 Chevrolet Impala has overhead valves (OHV).
The 2002 Chevrolet Impala has overhead valves (OHV).
The 2004 Chevrolet Impala has overhead valves (OHV).
The 2003 Chevrolet Impala has overhead valves (OHV).
The 2005 Chevrolet Impala has overhead valves (OHV).
The 2007 Chevrolet Impala has overhead valves (OHV).