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Rocker Arm plays one of the most critical parts of the vehicles particularly in Dodge Charger that enable the valvetrain component of the internal combustion engine to transfer motion from the pushrod to the intake/exhaust valves. Generally made of stamped steel or aluminum, the Rocker Arm acts as a lever that translates the pushrod's up-and-down movement to the down movement necessary for the valves to open. Aluminum is used where a relatively high RPM is the requirement because aluminum is lighter than other materials, Meanwhile, cast iron or forged carbon steel is used in diesel engines for strength. Newer models of Dodge Charger may include the roller rockers which are finer since they incorporate the use of needle bearings in their construction, therefore minimizing on the rate of wear and tear as compared to the standard designs. The rocker ratio has improved from 1.5:1 up to 1.8:1 in modern engines it enables camshaft lift to be exaggerated hence obtaining more performance. Lower ratios were the normality until the mid of 20 th century. Other superior fulcrum bearings are also used in high-RPM Challenger engines to take care of stress and enhance the Rocker Arm system's tenacity in the Dodge Charger.