Camshafts (Part 1) - Stock versus Performance Camshafts. Camshafts (Part 2) - Characteristics of a performance camshaft. Camshafts (Part 3) - Camshaft duration is explained. Camshafts (Part 4) - Valve overlap. Camshafts (Part 5) - Camshaft lift is explained. Single over head cam. Double overhead cam" Over head valve" Valve clearance. Springreturnvalves. Cylinder head. How to adjust/shim a overhead camshaft.