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COMP Cams 4657-16 Hi-Tech Polylock Adjusting Nut Set for 1/2" Stud Ultra Pro Magnum Rockers

Manufacturer

Picture for manufacturer COMP Cams

Part Number

4657-16
12 reviews
Sale Price

$115.95

In Stock (6)

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Usually delivered within 2 days

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Fitment guaranteed

Fitment guaranteed

Product Details

The COMP Cams 4657-16 Hi-Tech Polylock adjusting nut set is engineered for use with Ultra Pro Magnum rocker arms featuring 1/2" studs. This professional-grade locking nut system provides secure valve lash adjustment and prevents loosening under extreme engine conditions.

Key Features:

  • Designed specifically for 1/2" diameter rocker studs
  • Compatible with COMP Cams Ultra Pro Magnum rocker arm systems
  • Hi-Tech Polylock design ensures positive locking action without jamming
  • Prevents valve lash changes during high-RPM operation
  • Precision-machined threads for accurate valve adjustment
  • Set includes multiple nuts for complete rocker arm installation

These polylock nuts are an essential component for maintaining proper valve train geometry and ensuring consistent valve lash settings in performance and racing applications. The locking design eliminates the need for traditional jam nuts while providing superior holding power under vibration and thermal cycling.

Products specifications

Adjusting Nut Height

1

Stud Diameter

1/2

Rocker Arm Adjusting Nut Series

Hi-Tech

AMAZON ASIN

B00CWZVVG8

Prop 65

WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov

C.A.R.B. Exempt for Foreign Vehicles Manufactured Before 1967?

Yes, but must meet tailpipe emission standards for year of vehicle.

C.A.R.B. Exempt for On-Road Vehicles?

Yes

C.A.R.B. Exempt for Racing and Off-Road Only Vehicles?

Yes, but must be a race/competition only vehicle.

C.A.R.B. Exemption Reason

No impact on pollution output of vehicle.

C.A.R.B. Exempt for California Certified Vehicles Manufactured Before 1965?

Yes, but must meet tailpipe emission standards for year of vehicle.

C.A.R.B. Exempt for Federally Certified Vehicles Manufactured Before 1967?

Yes, but must meet tailpipe emission standards for year of vehicle.

Great pricing ease of use

good

very quick and easy

great site as long as my part gets to me thank you

Great service

Great product. Good communication and customer service!!!

Easy lookup and like style of shock listing

Easy to search

awesome

I got a cargo box from autoplicity. As far as online purchases go to delivery, everything went perfectly. The only comment I have for Autoplicity would be to send out a confirmation email when the purchase is first made. The first communication wasn't until 3 days after I made the purchase.

Good price

I'm very pleased with Autoplicity. i needed a new battery for my antique Ford.After much searching,I found Autoplicity had it for over $25.00 less than the next lowest price I found. My order was shipped in less than 24 hrs. Thank you. I'll be recommending Autoplicity on the Ford forums I belong to

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