The original Ultra-Gold Aluminum Rockers changed the way racing and high performance street engine builders approached valve train design. Now, COMP Cams is revolutionizing valve train performance again with the next generation of Ultra-Gold ARC Series Aluminum Rocker Arms, featuring an Arced, Recessed, Contoured design. Using cutting-edge design techniques and manufacturing processes, Ultra-Gold ARC Rockers increase engine power, enhance valve train stability and improve oiling. Ultra-Gold ARC Rockers feature a new extrusion based on improvements developed through FEA analysis, resulting in an even stronger, stiffer body without compromising mass. A new arced channel and contoured top, similar to a bridge design, give the rockers the best strength-to-weight ratio possible. The body has additional CNC contouring to improve clearances for valve covers and springs. Manufactured entirely in the U.S.A., all Ultra-Gold ARC Series Aluminum Rocker Arms feature a spring oiler channel through the body for improved lubrication. Trunnion retaining clips have been replaced with an ultra durable spiral lock type clip, similar to what holds a piston pin in place. Stress relieving radii have also been added to areas of the body, trunnion and pushrod seat insert. Even the included locking nuts (not used in LS applications) have been revised to increase surface area to better maintain lash and eliminate wear. * Increase engine power, enhance valve train stability and improve oiling * CNC-machined, lightweight design removes weight and yields unrivaled quality and ratio accuracy * Arced channel & contoured top give the rockers the best strength to weight ratio possible * Precision-sorted trunnion bearings withstand valve spring pressure up to 700 lbs. * Designed for high performance street and race engines PartNumber : cca19054-16 Description : Ultra-Gold Aluminum Rocker Arm; 16 Pieces Title : 19054-16 Alum Ped MT Rockers,Ford SB 1. 7 5/16 ARC Stud Diameter : 3/8" Ratio : 1.5 California Proposition 65 : WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov Engine Family : Ford 302-351W (1977-1992) Maximum Valve Spring Open Pressure : 700 Rocker Arm Material : Aluminum Rocker Arm Ratio : 1.7 Rocker Arm Series : Ultra-Gold ARC Aluminum Rocker Stud Diameter : 5/16 Pedestal Mount 1977 Ford Custom 500 Base V8.-cc Engine Components::Rocker Arms 1977-1978 Ford F-100 Base V8.-cc Engine Components::Rocker Arms 1977-1979 Ford F-100 Custom V8.-cc Engine Components::Rocker Arms 1977-1978 Ford F-100 Northland V8.-cc Engine Components::Rocker Arms 1977-1979 Ford F-100 Ranger V8.-cc Engine Components::Rocker Arms 1978-1979 Ford F-100 Ranger Lariat V8.-cc Engine Components::Rocker Arms 1977-1979 Ford F-100 Ranger XLT V8.-cc Engine Components::Rocker Arms 1977 Ford F-100 XLT V8.-cc Engine Components::Rocker Arms 1977-1978 Ford F-150 Base V8.-cc Engine Components::Rocker Arms 1983-1986 Ford F-150 Base V8.-cc Engine Components::Rocker Arms 1977-1982 Ford F-150 Custom V8.-cc Engine Components::Rocker Arms 1987-1992 Ford F-150 Custom V8.-cc Engine Components::Rocker Arms 1977-1978 Ford F-150 Northland V8.-cc Engine Components::Rocker Arms 1977-1981 Ford F-150 Ranger V8.-cc Engine Components::Rocker Arms 1978-1981 Ford F-150 Ranger Lariat V8.-cc Engine Components::Rocker Arms 1977-1981 Ford F-150 Ranger XLT V8.-cc Engine Components::Rocker Arms 1982-1993 Ford F-150 XL V8.-cc Engine Components::Rocker Arms 1982-1983 Ford F-150 XLS V8.-cc Engine Components::Rocker Arms 1977 Ford F-150 XLT V8.-cc Engine Components::Rocker Arms 1983-1984 Ford F-150 XLT V8.-cc Engine Components::Rocker Arms 1993 Ford F-150 XLT V8.-cc Engine Components::Rocker Arms 1982 Ford F-150 XLT Lariat V8.-cc Engine Components::Rocker Arms 1985-1992 Ford F-150 XLT Lariat V8.-cc Engine Components::Rocker Arms 1984-1985 Ford Mustang GT V8.-cc Engine Components::Rocker Arms 1984 Ford Mustang GT-350 20th Anniversary V8.-cc Engine Components::Rocker Arms 1984 Ford Mustang L V8.-cc Engine Components::Rocker Arms 1984 Ford Mustang LX V8.-cc Engine Components::Rocker Arms