Adjustable Vacuum Advance AC31035

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Adjustable Vacuum AdvanceGM/HEI V8 Distributors with Vacuum AdvanceAC3103531035Gain instant horsepower & throttle response with ACCEL's Adjustable Vacuum Advance. Permits infinite adjustment to both amount and rate of advance. Maximum spark without damaging detonation (ping). Includes allen wrench and detailed instructions. Show more