As a result, these rocker arms have been dyno-tested to produce 15-20 horsepower increases, making valve stems and guides last longer. Magnum Rollers fit 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974 Chevy big block engines (1.70 ratio) like a glove, helping ensure a lasting fit. Each rocker is supplied with a rocker ball and lock nut. Set of 16.
The Vehicle Fitment Guide is to be used as a general reference. The data has been provided by our suppliers and manufacturers and may contain errors or incorrect data. Always refer to a professional to verify correct fitment for your vehicle.