Valve train: The system which operates intake and exhaust valves, consisting of camshaft(s), valves springs, lifters, push rods and rocker arms. Related posts: Personnel Management Operative Functions Administrative Role of PM Competency HR Management Role Change Personnel Policies Personnel Procedures Appealed Policies Implied Policies Specific Policies Personnel records Research Pure research Personnel research Attitude or Opinion Survey Turnover Secondary research Applied research Personnel audit Read more articles Previous PostValve overlap Next PostVariable Length Intake Manifold (VLIM)