2022 ARP Catalog

86 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 re- sistance to flex. Available in both High Per- formance and Pro Series models. NOTE: Not to be used with OEM-style, self-locking nuts. To be used with ARP’s patented Per- ma-Loc® adjusters (see page 88). IMPORTANT TECH NOTE It is highly advisable to determine what the optimum rocker arm stud length is for your particular application. This is espe- cially true when “long” pushrods and valves are employed - you should raise the “installed height” of the rocker arm to compensate for the longer -than-stock components. CYLINDER HEAD 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

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