Vacuum Advance - Adjustable - Built-In Stop - GM HEI Distributors - Each

Moroso 75-81 GM HEI Adjustable Vacuum Advance Kit

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Moroso 75-81 GM HEI Adjustable Vacuum Advance Kit

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Distributor Advance, Vacuum, Adjustable, GM, HEI, Kit

Dial in spark advance with Moroso adjustable vacuum advance kits. They allow you to change the amount of ignition vacuum advance for maximum part-throttle performance while preventing harmful effects of detonation--spark knock. These kits can be adjusted as conditions permit; add more for improved throttle response and fuel economy under light loads or less for high loads and high compression engines to eliminate knock. Vacuum advance kits have a built-in stop to prevent the adjustment screw from "backing out" and include Allen wrench and easy-to-follow instructions for a no-hassle install. Get dialed-in for a better run with Moroso adjustable vacuum advance kits.