8428 MSD GM HEI Weight & Spring Kit

Advance Kit, GM HEI, Weight & Spring GM HEI Weight & Spring Kit The Kit comes with new advance weights, springs to set the rate of advance and new bushings. 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