ARP 300-8246 Perma-Loc Rocker Arm Adjusters Chrome Moly - 12-Point

ARP's patented Perma-Loc rocker arm adjusters eliminate the constant need to re-adjust rocker arms in high-performance engines. Unlike conventional poly locks that require continual tightening, these precision-engineered adjusters stay locked in place through superior design and manufacturing.

Superior Design Features:

• Forged in-house from 8740 chrome moly steel and heat-treated throughout—not just case hardened like competing products
• Threads machined exactly perpendicular to the adjuster bottom for even seating and 360-degree pressure distribution
• Set screw features flush-machined tip for optimum contact and secure seating on rocker arm stud
• 12-point head design with shouldered stop holds wrench in position while locking set screw with Allen wrench
• Bottom surface ground flush and perpendicular to threads for optimal seating
• Precision CNC-machined threads engineered for maximum engagement

The Perma-Loc design addresses the root causes of adjuster loosening: full heat treatment eliminates thread movement common to case-hardened adjusters, perpendicular thread machining ensures even pressure application, and the flush-ground set screw bottom maximizes contact area on the stud. No special adjusting tools required—the compact 12-point head makes installation and adjustment straightforward.