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The Hot Rockers system works by shifting the fulcrum pivot of the rocker arms as you drive. All rockers will shift together, so you cannot run different ratios on the intake and exhaust. The four-position fulcrum provides ratios from 1.1:1 up to 1.75:1 (higher or lower ratios can also be specified). An ECM shifts the ratios at user-defined rpm points via an electric motor mounted on the valve covers.