GM HEI Distributor 
Vacuum Advance

Fits GM HEI Models 1996 and Earlier
  • Fits GM HEI Models 1996 and Earlier
  • Will Not Work with Computer Controlled HEI Distributors
  • Adjustable Style Allows User To Fine-Tune The Vacuum Advance for Optimum Performance
  • Sold Individually
PART# 66952C
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HEI Adjustable Vacuum Advance Fits GM. 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.

  • Adjustable.
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