Adjustable Vacuum Advance Kit, GM Points Distributor
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Please note the following about this product:
- This item is sold as a kit.
Q & A (2)
What's in the Box
Adjusts GM points style distributors for any driving condition. Includes allen wrench and instructions. Easy to install.
Springs & cam plate not included (use 550-929 if needed).
- 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
- Includes 3/32" Allen wrench and easy-to-follow instructions