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Adjustable Vacuum Advance Kit, GM HEI Distributor

Adjustable Vacuum Advance Kit, GM HEI Distributor

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Please note the following about this product:

  • This item is sold as a kit.

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What's in the Box

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Adjust your GM HEI distributor for any driving condition. This kit allows you to change the amount of ignition vacuum advance for maximum part-throttle performance while preventing the harmful effects of spark knock (detonation). Dial in as much spark advance as conditions permit — add more advance under light load conditions to improve throttle response and fuel economy, or limit spark advance in high compression engines and high load conditions to eliminate knock.

  • Built-in stop prevents the adjustment screw from "backing out" like other designs
  • Easy to install
  • Includes 3/32" Allen wrench and easy-to-follow instructions

287-99600 Instructions (PDF)

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