ARP 300-8241 Perma-Loc Rocker Arm Adjusters Chrome Moly - 12-Point

ARP's patented Perma-Loc rocker arm adjusters eliminate the constant need to re-adjust valve lash in high-performance engines. Unlike conventional poly locks that require frequent retightening, these precision-engineered adjusters maintain their settings under the most demanding conditions.

Superior Design Features:

• Heat-treated throughout from 8740 chrome moly steel—not just case hardened like competitors
• Threads machined exactly perpendicular to the adjuster bottom for even 360-degree pressure distribution
• Flush-ground bottom ensures optimal seating on rocker arm studs
• 12-point compact head with shouldered stop holds wrench in position during adjustment
• Set screw features flush-machined tip for maximum contact area on stud
• Precision CNC-machined threads for maximum engagement and zero movement

The Perma-Loc design addresses the root causes of adjuster loosening: full heat treatment eliminates thread movement, perpendicular machining ensures even seating, and the flush-ground set screw provides optimum contact. Installation is simplified with the 12-point head that requires no special adjusting tools—just hold your wrench in place while tightening the Allen set screw.