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Fast & Free ShippingFair PriceBest Offer GuaranteedHigh PerformanceHassle Free ReturnsPersonalized Customer Service About Us Home Feedback ContactMSDMSD Vacuum Advance Lockout For GM HEI Distributors Quick, Easy Install#88364 Item Description BRAND NEW IN BOX MSD Vacuum Advance Lockout for GM HEI 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 t...

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