Start with the compression gauge at zero. Then crank the engine through four compression strokes (four puffs).

6-6 Engine Mechanical 8.1L Engine Engine Mechanical Specifications (cont’d)

Maximum Valve Spring Installed Height Shim (Service Only) 0.726 mm 0.030 in Maximum Valve Spring Tension Shim (Service Only) 0.726 mm 0.030 in Maximum Combined Valve Spring Installed Height and Valve Spring 1.524 mm 0.060 in Tension Shim

GM SPO Group Numbers

Application GM SPO Group Number

Camshaft 0.519 Camshaft Sprocket 0.736 Camshaft Timing Chain 0.724 Crankshaft 0.646 Crankshaft Bearing Kit 0.096 Crankshaft Sprocket 0.728 Connecting Rod 0.603 Cylinder Head 0.269 Cylinder Head Gasket Kit 0.289 Camshaft Positioin Sensor Gasket Kit 2.363 Exhaust Gas Recirculation (EGR) Valve 3.670 EGR Valve Gasket 3.680 Exhaust Manifold 3.601 Exhaust Manifold Gasket 3.270 Engine Front Cover 0.206 Engine Front Cover Gasket 0.207 Intake Manifold (with gasket) 3.265 Oil Filter 1.836 Oil Level Indicator 1.516 Oil Pan 1.426 Oil Pan Gasket 1.429 Oil Pump Cover 1.723 Oil Pump Cover Gasket 1.724 Oil Pump (with gasket) 1.652 Piston Ring Kit 0.643 Spark Plug 2.270 Valve Lifter 0.459 Thermostat 1.246 Valve Pushrod 0.426 Valve Rocker Arm 0.333 Valve Rocker Arm Cover Gasket Kit 0.423 Water Pump Kit (with gasket) 1.069