Description
ARP designed their 300-8245 Perma-Loc Rocker Arm Adjuster Nut Kit for stamped steel rocker arms. The adjusters have a 12-Point head, are 1.200″ long, have a 7/16″-20 thread and a .550 shank size. Sold as a set of 16.
One of the more aggravating things found in many high-performance engines is constantly having to re-adjust rocker arms. Until ARP introduced the patented Perma-Loc adjuster, there wasn’t a “poly lock” on the market that you didn’t have to continually tighten. There are several important reasons why ARP’s exclusive Perma-Loc rocker arm adjusters won’t loosen like others:
First, heat-treating the adjuster body all the way through (not just case hardening) eliminates the thread “movement” common to others.
Secondly, ARP machines the threads exactly perpendicular to the bottom of the adjuster. This ensures that the adjuster seats evenly and applies pressure on a full 360˚ circle.
Lastly, they machine the set screw flush on the bottom (not pointed). This provides optimum contact on the rocker arm stud.
You’ll find ARP Perma-Loc’s easy to use, too. The compact 12-point head holds your wrench in position while you lock the set screw with an Allen wrench.
All in all, they’re the best you can buy.
ARP 300-8245 Perma-Loc Rocker Arm Adjuster Nut Kit Fits:
- Aluminum Rocker Arms
Because there are many different style rocker arms made by each manufacturer, we suggest that you verify the physical dimensions and thread requirements prior to ordering.
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