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The Rocker Arm in Chevrolet Traverse vehicles is important in converting transfers the movement from the pushrod to either the intake or exhaust valve to enable functioning of the engine. Usually made from stamped steel or aluminum, these parts generate the requisite downward movement from the vertical motion to lift the valves. Various kinds of Rocker Arms, which include the roller rockers featuring needle bearings, are employed to eliminate contact between the parts and thus wear on the contacting surfaces for improved engine performance. The rocker ratio established to drive the valve in relation to the push rod movement can be between 1.5:1 and 1.8:1 affects the lift and efficiency of the engine. Sometimes you get improved fulcrum bearings to support the high stress and for enhanced durability in high rotation per minute engines.