Valve Train - RPO L92

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First design engines are built to contain the following active fuel management components:

Active fuel management valve lifters
Active fuel management valve lifter guides
Valve lifter oil manifold assembly
Camshaft with active fuel management specifications

Second design engines are built to contain the following non-active fuel management components:

Non-active fuel management valve lifters
Non-active fuel management valve lifter guides
Engine valley cover
Camshaft with non-active fuel management specifications

First design engines with active fuel management components: Motion is transmitted from the camshaft through the hydraulic roller valve lifters and tubular pushrods to the roller type rocker arms. The nylon valve lifter guides position and retain the valve lifters. The valve rocker arms for each bank of cylinders are mounted on pedestals or pivot supports. Each rocker arm is retained on the pivot support and cylinder head by a bolt. Valve lash is net build. Cylinders 1, 4, 6, and 7 contain active fuel management components. For first design RPO L92 engines, active fuel management hardware is present in the engine. The system is inactive for the 2007 model year. Refer to Cylinder Deactivation (Active Fuel Management) System Description .

Second design engines without active fuel management components: Motion is transmitted from the camshaft through the hydraulic roller valve lifters and tubular pushrods to the roller type rocker arms. The nylon valve lifter guides position and retain the valve lifters. The valve rocker arms for each bank of cylinders are mounted on pedestals or pivot supports. Each rocker arm is retained on the pivot support and cylinder head by a bolt. Valve lash is net build. For second design RPO L92 engines, active fuel management hardware is not present in the engine.