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Preferred by professional racing engine builders, Energizer Aluminum Rocker Arms offer outstanding power and performance advantages for street applications. An easy afternoon installation project, bolting on a set of Crane aluminum rockers can add between 15 to 30+ horsepower plus increased throttle response in a street performance engine. These rockers are so strong, durable and reliable that Ford Motor Company selected the Crane Energizer Rockers for their Cobra V8 production engines with the full Ford Factory .