helps to have the year but 96 and up are computer controlled and there is no timing adjusment only cam adjustment
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 2012 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.
gmc 1500 sierra was fuel injected in '92
The 2009 GMC Sierra-1500 has a V6 engine.
The 2014 GMC Sierra-1500 has 12 valves.