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MSD Performance 8428
GM HEI Weight & Spring Kit; The Kit comes with new advance weights, springs to set the rate of advance and new bushings.
MSD Performance 8468
Vacuum Advance Lockout; For use with Distributors, PN 8360, PN 8361 and PN 8572.
MSD Performance 88364
Vacuum Advance Lockout for GM HEI; Quick easy components to lock out timing on GM HEI distributors.
MSD Performance 8628
Advance Weight Kit for MSD Pro Billet Distributors; Allows you to tailor you timing curve for your particular application.
MSD Performance 88363
Mechanical Advance Lockout for 8362CT; Quick easy components to lock out timing on GM HEI distributors.