In many high performance engines, one aggravating issue is the need to constantly re-adjust rocker arms.
Until ARP introduced the patented Perma-Loc rocker arm adjuster, there was no 'poly lock' on the market that did not require continual tightening.
There are several important reasons ARP's exclusive Perma-Loc rocker arm adjusters will not loosen like others.
First, the adjuster body is heat treated throughout (not just case hardened), which eliminates the common thread 'movement' found in others.
Secondly, the threads are machined exactly perpendicular to the bottom of the adjuster, ensuring it seats evenly and applies pressure on a full 360-degree circle.
Lastly, the set screw is machined flush on the bottom, rather than pointed, allowing for optimum contact on the rocker arm stud.
The compact 12-point head of Perma-Loc adjusters is designed to hold your wrench in position while locking the set screw with an Allen wrench.
