ARP 300-8247 Perma-Loc Rocker Arm Adjusters Jacket - 16-Piece Set

ARP's Perma-Loc rocker arm adjusters eliminate the constant re-adjustment issues common with standard poly locks in high-performance engines. This 16-piece set features ARP's patented locking design that stays secure under the most demanding conditions.

Superior Engineering:

The Perma-Loc design incorporates three critical improvements over conventional adjusters. The adjuster body is fully heat-treated throughout (not just case hardened), eliminating thread movement that causes loosening. Threads are precision CNC-machined exactly perpendicular to the adjuster base, ensuring even seating and 360-degree pressure distribution. The set screw features a flush-machined bottom for maximum contact area on the rocker arm stud.

Key Features:

• Forged from 8740 chrome moly steel with through-hardening heat treatment
• 12-point head with shouldered stop holds wrench in position during adjustment
• Precision CNC-machined threads perpendicular to base for optimal seating
• Flush-ground set screw tip for maximum stud contact
• No special tools required for installation and adjustment
• Threads machined for maximum engagement and strength

The compact 12-point head design allows you to hold your wrench in position while simultaneously tightening the Allen set screw, making valve lash adjustments faster and easier than ever.