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The XL-12 is about 54cc's while the Super XL 12 was about 58cc's.
The 2012 GMC Yukon-XL has 16 valves.
The 2002 GMC Yukon-XL has 16 valves.
The 2009 GMC Yukon-XL has 16 valves.
The 2006 GMC Yukon-XL has 16 valves.
The 2001 GMC Yukon-XL has 16 valves.
The 2014 GMC Yukon-XL has 16 valves.
The 2011 GMC Yukon-XL has 16 valves.
The 2013 GMC Yukon-XL has 16 valves.
The 2005 GMC Yukon-XL has 16 valves.
The 2004 GMC Yukon-XL has 16 valves.
The 2015 GMC Yukon-XL has 16 valves.