Rocker Arm Nut Polylock

Polylock Race Series - Scorpion Racing Products 3/8 Race Series Polylock - Rocker Arm Nut

• High performance, hardened steel


• Made from 4140 machined steel with a black oxide coating for surface protection


• Overall Length 1.200"


• Outside Diameter .600"


• Single piece

A Polylock is an adjustable rocker arm nut. They are used with Stud Mount Rocker Arms.

How do they work?

A polylock features a threaded body and a set screw.



The body screws over the stud and holds the rocker arm in place. Then, the set screw is tightened down against the stud. This locks the body in place.

Why would I need them?

Polylocks make adjusting you valvetrain much easier. They are useful when Setting Preload on hydraulic lifters. They are required to Set Valve Lash on solid lifters.

Polylocks also come in various lengths. The longer body sticks up above the rockers to attach a Stud Girdle



Watch as Scorpion's Design Engineer shows you how to set valve lash.