A Component Comparison from the Previous Year

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

The 6.2L L9H engine replaces the 6.2L L92 engine. The L9H engine is E85 fuel capable.
A new design balancer bolt with a four step tightening process is used.
Production design engines will use a rivet-type plug replacing the coolant air bleed covers located at the top rear of each cylinder head. To properly repair a leaking plug, remove cylinder head from the engine, remove the plug from the cylinder head and install first design coolant air bleed cover and bolt.