BCCX 8428 GM HEI Weight & Spring Kit

The Kit comes with new advance weights, springs to set the rate of advance and new bushings.(Not for use with Billet and Pro-Billet MSD Distributors); This is designed for the Street Fire HEI and stock style HEI Distributors.; This kit will help you achieve the solid ignition timing you need!Features and Benefits: Fits Stock Style HEI Distributors; Fits Street-Fire HEI; Not for MSD Billet and Pro-Billet DistributorsMSDDMA