Application: --Compatible with most Ford engines --Stainless Steel ROLLER ROCKER ARMS Kit For Ford 1.6" 3/8" --16 CNC Stainless Steel Arms With Polylock Nuts --Creates less friction, allows more accurate valve adjustment and has extreme rigidity --Lightweight with integral push rod seat --Not self aligning--Fit most Ford --Full roller rocker Package: --16 stud mounted stainless steel roller rocker arms with 16 poly locks (what you see in the picture is what you'll get) --Professional Installation is Highly Recommended (No Instruction Included)