ARP 300-8249 Perma-Loc Rocker Arm Adjusters Jacket - 16-Piece Kit

The ARP 300-8249 Perma-Loc rocker arm adjusters eliminate the constant re-adjustment issues common with standard poly locks in high-performance engines. This 16-piece kit features ARP's patented locking design that stays tight under extreme conditions.

Superior Engineering:

ARP's exclusive Perma-Loc design solves the loosening problems found in conventional rocker arm adjusters through three critical engineering features. The adjuster body is heat-treated throughout its entire structure—not just case hardened—eliminating the thread movement that plagues other designs. Threads are precision CNC-machined exactly perpendicular to the adjuster bottom, ensuring even seating and 360-degree pressure distribution. The set screw features a flush-machined bottom rather than a pointed tip, maximizing contact area on the rocker arm stud for superior holding power.

Key Features:

• Forged in-house from 8740 chrome moly steel with full heat treatment for maximum strength
• 12-point head with shouldered stop holds wrench in position during adjustment
• Eliminates need for special adjusting tools—standard wrench and Allen key
• Precision CNC-machined threads perpendicular to base ensure optimal seating
• Flush-ground bottom and set screw tip for maximum contact surface
• Threads machined for maximum engagement and holding power
• 16-piece kit for complete valve train applications

Designed for serious performance applications where valve train stability is critical. The compact design allows easy adjustment even in tight engine compartments while the patented locking mechanism ensures settings stay exactly where you set them.