PERMA-LOC
Adjust. Rocker Arm Nuts w/12 Point Heads
| One of the more aggravating things found in
many high performance engines is constantly having to re-adjust rocker
arms. Fact is, up until ARP introduced the patented Perma-Loc adjuster,
there wasn’t a ‘poly lock’ on the market that you didn’t
have to keep adjusting. There are several important reasons why ARP’s
exclusive Perma-Loc rocker arm adjusters won’t loosen like others.
First, the adjuster body material is premium grade 8740 chrome moly steel
which has been heat treated all the way through, not just case hardened.
This eliminates common thread movement. Threads are machined exactly perpendicular
to the bottom of the adjuster, so it seats evenly and applies pressure
on a full 360deg. circle. Lastly, the set screw is machined flush on the
bottom, so it will have optimum contact on the rocker arm stud. ARP Perma
Locs are easy to use. The compact 12 point head is designed to hold your
wrench in position while you lock the set screw with an allen wrench.
With most ‘poly-locks’ you have to invest in a special tool
to do this job. 190,000psi tensile strength.
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| CHEVROLET, SMALL BLOCK | ||||
| 16pc pack |
Thread Size | Shank Size | Length | Application |
AR300-8243  |
3/8-24 | .550 | 1.200 | Aluminium Rocker |
| AR300-8244 |
3/8-24 | .600 | 1.200 | Aluminium Rocker |
| AR300-8245 |
7/16-20 | .550 | 1.200 | Aluminium Rocker |
| AR300-8246 |
7/16-20 | .600 | 1.200 | Aluminium Rocker |