Hei Vacuum Advance Stop Plate The Kit Is Supplied With Vacuum Advance Limiter, Blue Bushing And Mounting Screws MSD Ignition

Vacuum Advance Mechanism For Use With Pro Billet And Ready To Run Distributors W/Vacuum Advance. Does Not Fit Pn 8365/83653 And Pn 8362/83623 MSD Ignition

Vacuum Advance Lockout For Use With Distributors, Pn 8360, Pn 8361 And Pn 8572 MSD Ignition

Vacuum Advance Lockout For GM Hei Quick Easy Components To Lock Out Timing On GM Hei Distributors MSD Ignition