64 800-826-3045 Red part numbers indicate new items ROCKER ARM STUDS NOTE: To verify the application and part number, please review the various dimensions: B) overall stud height C) screw-in thread depth D) adjuster thread depth E) shank diameter and thread F) base diameter and thread. B D C F E HIGH PERFORMANCE SERIES Made of 8740 chrome moly forgings and heat-treated to 180,000 psi. Excellent for E.T. Bracket Racing, limited rule oval track competition and street use. PRO SERIES Designed for competition applications, ARP’s Pro Series rock- er arm studs are made of premium grade 8740 chrome moly steel and heat-treated to a tensile strength of 190,000 psi. ROCKER ARM STUDS If you have ever installed a rocker stud into a cylinder head and watched it wobble as it screwed in – you knew from the beginning that the rocker geometry was going to be inconsistent all over the place. ARP rocker studs are concentric within .005 T.I.R. thread pitch to thread pitch. They run-in straight and true. Lengths are exact – designed to provide positive seating every time. An extra- large radius base offers greater resistance to flex. Available in both High Performance and Pro Series models. NOTE: Not to be used with OEM-style, self-locking nuts. To be used with ARP’s patented Perma-Loc™ adjusters (see page 66).