Description
Features:
- HEI Adjustable Vacuum Advance
- Will Not Work with Computer Controlled HEI Distributors
- GM HEI Distributors Pre to 1997
- Allows User To Fine-Tune The Vacuum Advance for Optimum Performance
- PROFORM Parts Brand Product
HEI Adjustable Vacuum Advance Fits GM Style HEI Distributors, including Ford, AMC, and Chrysler Models. For fine-tuning your vacuum advance and optimum performance.
Setting Instructions: Counter-clockwise rotation reduces the vacuum, and do not turn more than 5 full turns because the screw can fall out.