Engine components, in particular, cylinder heads, camshafts, cams being parts of machines and as machine components, valves being parts of machines and as machine components; engine components for valve control, in particular, drag levers being parts of machines and as machine components for valve control and roller drag levers, rocker levers being parts of machines and as machine components for valve control and rocker levels in the nature of rocker arms, tappets being part of machines for v...