It depends on which Range Rover you are talking about.
A Classic?
A mkIII?
etc.
The 2004 Land-Rover Range-Rover has a 4.4 L base engine size.
The 2009 Land-Rover Range-Rover has a 4.4 L base engine size.
The 2002 Land-Rover Range-Rover has a 4.6 L base engine size.
The 2012 Land-Rover Range-Rover has a 5.0 L base engine size.
The 2011 Land-Rover Range-Rover has a 5.0 L base engine size.
The 2007 Land-Rover Range-Rover has a 4.4 L base engine size.
The 2010 Land-Rover Range-Rover has a 5.0 L base engine size.
The 2013 Land-Rover Range-Rover has a 5.0 L base engine size.
The 2014 Land-Rover Range-Rover has a 3.0 L base engine size.
The 2001 Land-Rover Range-Rover has a 4.6 L base engine size.
The 2005 Land-Rover Range-Rover has a 4.4 L base engine size.
The 2008 Land-Rover Range-Rover has a 4.4 L base engine size.