Camshaft Lobe(s) problems—Camshaft Timing Sprocket Chain Set problems—Tappet Lifters—Pushrods—Rocker Arms—Valve Locks—Valve Retainers—Valve Springs—Valve Seals—Valve Guides—Valve Seats—and the Poppet Valve & Stem DRASTIC PROBLEM of falling into the Piston Cylinder area at any operating RPM...