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Scorpion Racing

Rocker Arm Nut Polylock

Rocker Arm Nut Polylock

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Regular price $5.99
Regular price Sale price $5.99
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Part Number : PL38-1
Polylock Type
Stud Size
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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

Scorpion Racing Products 3/8" Polylock

Made in the USA! That says it all!

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.

An Example of a Polylock

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.

Additional Information

Weight 0.056 oz
Dimentions 2 x 3 x 1 in


Make Universal
Engine Type Universal
Engine Family Universal
Mounting Style Stud
Stud Size 3/8"
Offset no offset
Self Aligning
Head Type N/A