COMP CamsĀ® Magnum Roller Rockers are the ultimate street rocker. That?s because they were designed with the serious performance enthusiast in mind. They will help your engine make more power and last longer. A great set of rocker arms available to you from Eckler's Chevy Truck, Competition Cams' unique forge-cast roller tip design greatly reduces friction in your 1947-1970 Chevy truck's small block engine. As a result it has been dyno-tested to produce 15-30 horsepower increases and it makes valve stems and guides last longer. Magnum Rockers fit all 55-70 small block engines (1.52 rocker ratio). Each rocker is supplied with a rocker ball and lock nut. Set of 16. Fits all 1947, 1948, 1949, 1950, 1951, 1952, 1953, 1954, 1955, 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966,
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