A1: Cylinder Head and Valve Train Diagnosis and Repair Adjust Valve Clearance Camshaft & Flat Lifter Camshaft & Roller Lifter Camshaft Runout Check Dry Sump Oil System Replace Head Gasket Replace Timing Chain Rocker Arm Ratio Timing and Balance Shafts Timing Belt, Remove and Replace Valve Guide Wear Checks Valve Seals Valve Spring Installed Height Valve Stem Clearance Valve Stem Height Vane Phaser Variable Displacement System Variable Valve Timing VVT Operation