ARP 135-7202 High Performance Series Black Oxide 7/16-14" Base Diameter 2.350" Stud Height Rocker Arm Stud Kit with Aluminum Head for Big Block Chevy Description: BB Chevy w/aluminum heads rocker arm stud kit Pkg: kit Pkg Type: skin Material_1: 8740 chrome moly Finish_1: black oxide Material_2: N/A Finish_2: N/A Origin: USA Category: Cylinder Head Product Line: Rocker Arm Kit Type: Stud