ARP 300-8244 Perma-Loc Aluminum Rocker Arm Adjusters

ARP's patented Perma-Loc rocker arm adjusters eliminate the constant readjustment issues common with standard poly locks in high-performance engines. These precision-engineered adjusters feature superior design elements that ensure they stay locked in place under extreme conditions.

Key Features:

• Forged from 8740 chrome moly steel and heat-treated throughout (not just case hardened) to eliminate thread movement
• Threads machined precisely perpendicular to the adjuster bottom for even 360-degree pressure distribution
• Set screw with flush-machined tip provides optimum contact and seating on rocker arm stud
• 12-point head with shouldered stop holds wrench in position while locking set screw with Allen wrench
• Bottom flush-ground perpendicular to threads ensures proper seating
• CNC-machined threads for maximum engagement and precision fit

The Perma-Loc design addresses the root causes of adjuster loosening: full heat treatment prevents thread deformation, perpendicular thread machining ensures even seating, and the flush-bottom set screw maximizes contact area. No special adjusting tools required—the compact 12-point head design simplifies installation and adjustment.