Rocker arms are little levers that touch the lobes, or cams, on the camshaft. When a lobe lifts one end of the rocker, the other end of the rocker presses down on the valve stem, opening the valve to let air in to the combustion chamber or letting exhaust out. It works sort of like a see-saw.
The valvetrain is the mechanical system that’s mounted to the cylinder head that controls the operation of the valves. The valve train consists of valves, rocker arms, pushrods, and lifters.
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