The 2007 GMC Sierra-1500 has 16 valves.
The 2007 GMC Acadia has 24 valves.
The 2007 GMC Savana has 16 valves.
The 2007 GMC Canyon has 16 valves.
The 2007 GMC Yukon has 16 valves.
The 2007 GMC Yukon-XL has 16 valves.
The 2007 GMC Sierra-2500HD has 16 valves.
The 2007 GMC Sierra-3500HD has 16 valves.
The 2007 GMC Savana-Cargo has 12 valves.
The 2007 GMC Yukon has overhead valves (OHV).
The 2007 GMC Savana has overhead valves (OHV).
The 2007 GMC Sierra-3500HD has overhead valves (OHV).
The 2007 GMC Yukon-XL has overhead valves (OHV).