The 2008 GMC Acadia has 24 valves.
The 2008 GMC Canyon has 16 valves.
The 2008 GMC Yukon has 16 valves.
The 2008 GMC Savana has 16 valves.
The 2008 GMC Savana-Cargo has 12 valves.
The 2008 GMC Sierra-2500HD has 16 valves.
The 2008 GMC Sierra-3500HD has 16 valves.
The 2008 GMC Yukon-Hybrid has 16 valves.
The 2008 GMC Yukon-XL has 16 valves.
The 2008 GMC Savana has overhead valves (OHV).
The 2008 GMC Yukon has overhead valves (OHV).
The 2008 GMC Sierra-3500HD has overhead valves (OHV).