Vac. Adv. Lockout for GM HEI (not 8365) - Vacuum Advance Lockout for GM HEI

Both of these parts are standard equipment on the MSD Circle Track HEI distributor but will work on most GM HEI's. | MSDs mechanical advance lockout plate replaces the mechanical advance weights and simply slides over the pins on the shaft and the advance assembly to eliminate any mechanical timing advance. | The vacuum advance block off kit bolts in place of the vacuum advance canister on a GM HEI distributor to neatly and effectively lock timing solid. | MSD offers two kits to make locking out mechanical and vacuum timing advance in HEI distributors an easy task for Circle track racers. No more welding a tac on the mechanical advance weights or trying to find a way to keep the vacuum advance from moving once the canister is removed.

Quick easy components to lock out timing on GM HEI distributors.