This Crane adjustable vacuum advance kits let you tailor your ignition to the advance you want. The adjustability provided by these kits permits you to run the maximum amount of ignition advance throughout the rpm range, without incurring detonation. Once they're installed, you can quickly compensate for changes in fuel quality and altitude. Each kit comes with a vacuum diaphragm, an Allen wrench, advance weight springs, and instructions.
Includes vacuum canister, vacuum diaphragm, weight spring and Allen wrench
Permits you to run the maximum ignition advance throughout the RPM range
Quickly compensate for changes in fuel quality and altitude
Single spring
Comes with complete instruction for easy installation and operation