When you have installed a rocker stud into a cylinder head and observed it wobble as it screws in, you knew from the start that the rocker geometry would be inconsistent throughout.
ARP rocker studs are concentric within .005 T.I.R.
from thread pitch to thread pitch.
They run straight and true.
Lengths are exact and designed to ensure positive seating every time.
An extra-large radius base provides greater resistance to flex.
Available in both Pro Series and High Performance models.
NOTE Not to be used with OEM-style, self-locking nuts.
To be used with ARP's patented Perma-Loc adjusters.
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.
Tip ground flush for optimum adjuster seating.
PRO SERIES Designed for competition applications, ARP's Pro Series rocker arm studs are made of premium grade 8740 chrome moly steel and heat-treated to a tensile strength of 200,000 psi.
IMPORTANT TECH NOTE It is highly advisable to determine the optimum rocker arm stud length for your specific application.
This is especially true when long pushrods and valves are used; you should raise the installed height of the rocker arm to compensate for the longer-than-stock components.
Rocker Arm Studs High Performance Series Adjuster Thread Depth 0.85 Base Dia/Thread M8 x 1.25 Screw-In Thread Depth 0.6 Shank Dia/Thread 3/8-24 Stud Height 1.75.
