Depending on what motor it is, the most common being the 350, you should want to to start by putting the motor on top dead center, compression stroke. then using the firing order,1-8-4-3-6-5-7-2. Adjust the valves in that order, by turning the crank a quarter of a turn, you will bring each cylinder to tdc individually. Start with number one then move in that order. You want to set the valves at zero lash then give them a third to a half turn further after reaching zero lash.
on a 350 engine to adjust valves tighten them down with engine running then back them off until it smooths out probably about a quarter of a turn
The 2001 Chevrolet Suburban has 16 valves.
The 2013 Chevrolet Spark has 16 valves.
The 2011 Chevrolet Impala has 12 valves.
The 2012 Chevrolet Suburban has 16 valves.
The 2009 Chevrolet Colorado has 16 valves.
The 2006 Chevrolet Express has 12 valves.
The 2011 Chevrolet Traverse has 24 valves.
The 2009 Chevrolet Impala has 12 valves.
The 2011 Chevrolet Camaro has 24 valves.
The 2012 Chevrolet Tahoe has 16 valves.
The 2001 Chevrolet Malibu has 12 valves.