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.

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
  • Sold Individually
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