Constructed from CNC machined heat treated billet aluminum, Crane Gold-Race rocker arms are the strongest and most capable rockers available. Designed with both the serious drag racer and street-performance enthusiast in mind, Gold Race rockers can handle up to 700 lbs of spring pressure in standard configuration or 900 lbs in wide body form. Whether you are rebuilding a mildly upgraded street engine or need to squeeze as much power possible from race engine, the Crane Gold Race series is the best choice.