The 2005 Toyota Sienna has 24 valves.
The 2013 Toyota Sienna has 24 valves.
The 2010 Toyota Sienna has 24 valves.
The 2004 Toyota Sienna has 24 valves.
The 2003 Toyota Sienna has 24 valves.
The 2009 Toyota Sienna has 24 valves.
The 2014 Toyota Sienna has 24 valves.
The 2012 Toyota Sienna has 16 valves.
The 2001 Toyota Sienna has 24 valves.
The 2008 Toyota Sienna has 24 valves.
The 2011 Toyota Sienna has 16 valves.
The 2002 Toyota Sienna has 24 valves.