ARP Auto Racing 300-8241 Rocker Arm Nut

Exclusive 12 Point Head Heat Treated Premium Grade A 8740 Chrome Moly Steel Rated At 190 000 PSI Tensile Strength Precision Machined Threads Locking Set Screw Ground Flush With Rocker Arm Stud Doesn’t Require Special Tools Limited 90 Day Warranty

Specifications

Compatibility - Stamped Steel Rocker
Style - Perma-Loc
Length (IN) - 1.2 Inch
Thread Size - 3/8-24 Inch
Body Diameter (IN) - 0.62 Inch
Head Style - 12-Point
Includes Set Screw - Yes
Quantity - Set Of 16

ARP has the missing link in valve train reliability. A rocker arm adjuster that won’t loosen! 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 the adjuster body is heat treated all the way through (not just case hardened). This eliminates the thread “movement” common to others. Secondly the threads are machined exactly perpendicular to the bottom of the adjuster so it seats evenly and applies pressure on a full 360 Degree circle. Lastly the set screw is machined flush on the bottom (not pointed) so it will have optimum contact on the rocker arm stud. You’ll find ARP Perma-Loc’s easy to use too. The compact 12 point head is designed to hold your wrench in position while you lock the set screw with an Allen wrench. All in all they’re the best you can buy!