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 : cca19052-1 Description : Ultra-Gold Aluminum Rocker Arm; Single Piece Title : 19052-1 Alum Ped MT Rocker Arm, Ford S B 1.6"5/16 Stud Diameter : 3/8" Ratio : 1.5 Rocker Stud Diameter : 5/16 Pedestal Mount 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 : 1.6 Rocker Arm Series : Ultra-Gold ARC Aluminum 1987-1991 Ford Country Squire Base V8.-cc Engine Components::Rocker Arms 1987-1991 Ford Country Squire LX V8.-cc Engine Components::Rocker Arms 1979-1982 Ford E-150 Econoline Base V8.-cc Engine Components::Rocker Arms 1984-1986 Ford E-150 Econoline Base V8.-cc Engine Components::Rocker Arms 1992 Ford E-150 Econoline Base V8.-cc Engine Components::Rocker Arms 1979-1982 Ford E-150 Econoline Chateau V8.-cc Engine Components::Rocker Arms 1979-1983 Ford E-150 Econoline Custom V8.-cc Engine Components::Rocker Arms 1987-1991 Ford E-150 Econoline Custom V8.-cc Engine Components::Rocker Arms 1983-1992 Ford E-150 Econoline XL V8.-cc Engine Components::Rocker Arms 1979-1981 Ford LTD Base V8.-cc Engine Components::Rocker Arms 1979-1981 Ford LTD Country Squire V8.-cc Engine Components::Rocker Arms 1980-1981 Ford LTD Crown Victoria V8.-cc Engine Components::Rocker Arms 1979 Ford LTD Landau V8.-cc Engine Components::Rocker Arms 1980-1981 Ford LTD S V8.-cc Engine Components::Rocker Arms 1977 Ford Maverick Base V8.-cc Engine Components::Rocker Arms 1977 Ford Maverick Grabber V8.-cc Engine Components::Rocker Arms 1983-1988 Ford Thunderbird Sport V8.-cc Engine Components::Rocker Arms