Description

This ARP 135-7121 BBC Rocker Arm Stud Kit is for most Big Block Chevy heads with screw in studs using Roller Rocker Arms. They have a 7/16″-20 top thread, and a 7/16″-14 base thread. Made from Black-Oxide coated 8740 Chromoly Steel and nominally rated at 180,000 PSI. 1.750″ overall stud height. These parts have a shank portion under hex to locate guide plate. Sold as a set of 2.

ARP 135-7121 BBC Rocker Arm Stud Kit Fits:

• Most Big Block Chevy heads using Roller Rockers, with Screw-In Studs

Have you have ever installed a rocker stud 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.

NOTE: These studs should be used with ARPs patented Perma-Loc adjusters ONLY. They are not to be used with OEM-style, self-locking nuts.