Valve Guides

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Inspecting Valve Lifter Guides

Courtesy of GENERAL MOTORS CORP.

Inspect the valve lifter guides for the following conditions:

Cracks or damage (1)
Excessive wear in the lifter mounting bores (2)