18 inch
It should be a 342.
The 2007 GMC Sierra-1500 has 16 valves.
The 2010 GMC Sierra-1500 has a V6 engine.
The 2006 GMC Sierra-1500 has 12 valves.
The 2004 GMC Sierra-1500 has 12 valves.
The 2011 GMC Sierra-1500 has a V6 engine.
The 2002 GMC Sierra-1500 has 12 valves.
The 2010 GMC Sierra-1500 has 12 valves.
The 2001 GMC Sierra-1500 has 12 valves.
The 2013 GMC Sierra-1500 is 17 ft. 1.6 in. (205.6 in.) long.
gmc 1500 sierra was fuel injected in '92
The 2009 GMC Sierra-1500 has a V6 engine.