ARP Cylinder Head Studs, Hex Head, Chevy, LS1/LS6, Kit, up to a 2003. ARP cylinder head stud kits are precision centerless-ground and thread-rolled to Mil-S-8879 specs. Their black oxide finish protects them from wear and corrosion, and ARP throws in hardened parallel washers for uniform load distribution and accurate torque readings. Picture is for reference only.