The 2012 GMC Sierra-2500HD's engine produces 380 ft-lbs. @ 4200 rpm.
The 2012 GMC Sierra-3500HD's engine produces 380 ft-lbs. @ 4200 rpm.
The 2012 GMC Sierra-1500's engine produces 260 ft-lbs. @ 2800 rpm.
The 2012 GMC Sierra-2500HD has 16 valves.
The 2012 GMC Sierra-3500HD has a V8 engine.
The 2012 GMC Sierra-3500HD has 16 valves.
The 2012 GMC Sierra-1500 has a V6 engine.
The 2012 GMC Sierra-2500HD has a V8 engine.
The 2012 GMC Sierra-1500 has 12 valves.
The 2012 GMC Sierra-1500-Hybrid's engine produces 367 ft-lbs. @ 4100 rpm.
The 2012 GMC Sierra-2500HD has overhead valves (OHV).
The 2012 GMC Sierra-2500HD has a 6-speed automatic.