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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1666 (Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L - Description And Operation) >> Description and Operation >> Engine Component Description >> Cylinder Heads

Cylinder Heads

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The cylinder heads are cast aluminum and have pressed in place powdered metal valve guides and valve seats. Passages for the engine coolant air bleed system are at the front of each cylinder head. The valve rocker arm covers are retained to the cylinder head by 4 center mounted rocker arm cover bolts. RPO LY6, L76, and L9H use a high-flow cylinder head with an offset intake valve rocker arm design.

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