- Ignition & Electrical
- Distributors
- Vacuum Advance & Advance Curve Components
- JEGS Adjustable Vacuum Advance for HEI
Fine Tune Your Ignition For Optimum Performace
JEGS Adjustable Vacuum Advance for HEI replaces the OE non-adjustable unit. Allows you to change the amount of ignition vacuum advance for maximum performance while preventing detonation. Improves fuel economy, throttle response, horsepower, and performance. Includes easy-to-follow instructions.