| Crane Cams 99600-1 Adjusting Vacuum Adv. Kit GM H.E.I. This product is applicable only to pre - 1966 Califonia and pre - 1968 federally certified passenger cars. It is also applicable to non - emission controlled trucks and similar vehicles. It is not applicable or intended for use on any emission controlled vehicles.
Now you can actually tailor your ignition system to meet a wide variety of driving conditions and requirements with these unique, easy-to-install adjustable vacuum advance kits. Comes complete with adjustable vacuum canister, featuring the unique adjustable vacuum diaphragm, three sets of advance weight springs, and a 3/32” allen wrench, plus complete instructions for installation and operation.
The adjustability provided by these kits permits you to run the maximum ignition advance throughout the RPM range, without encountering detonation. Improved performance, efficiency, and dependability are the major benefits obtained. Once the kit is installed, youcan also quickly compensate for changes in fuel quality and altitude.