GM HEI Weight & Spring Kit

The Kit comes with new advance weights, springs to set the rate of advance and new bushings.

PART# 8428

Suggested Retail: $24.88
Your Price:$22.39
Free Shipping on orders over $100*


This kit will help you achieve the solid ignition timing you need! This is designed for the Street Fire HEI and stock style HEI Distributors. (Not for use with Billet and Pro-Billet MSD Distributors)


  • Fits Street-Fire HEI
  • Fits Stock Style HEI Distributors
  • Not for MSD Billet and Pro-Billet Distributors


Emission Code1

Tech Resources


This part is legal for use on Emissions Controlled Vehicles when used in accordance with the manufacturers application guide because it has a California Air Resources Board Executive Order number or is a direct or consolidated replacement part.

The following vehicles are considered Emissions Controlled Vehicles:

  • 1966 and newer U.S. manufactured California Certified vehicles
  • 1968 and newer U.S. manufactured Federally Certified vehicles
  • 1968 and newer Foreign manufactured vehicle
*Free Shipping & Handling only offered to the continental US on orders over $100.