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MSD 8428 GM HEI Weight & Spring Kit
Fits Street-Fire HEI
Fits Stock Style HEI Distributors
Not for MSD Billet and Pro-Billet Distributors
This kit will help you achieve the solid ignition timing you need. The kit comes with new advance weights, springs to set the rate of advance and new bushings. This is designed for the street fire HEI and stock style HEI distributors. (Not for use with MSD's PN 8365 pro-billet HEI).