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JEGS Adjustable Vacuum Advance For GM V8 HEI


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JEGS 40003
More than 10 available
Adjustable Vacuum Advance
  • For GM V8 HEI
  • Ships

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    40003 is rated 3.8 out of 5 by 4.
    Rated 5 out of 5 by from Works as advertised. I was not happy with the hot start function of the 350 HO crate engine I have in my GMC S15 pickup. I decide to install the HEI Adjustable Vacuum Advance to see if this may help the situation. The install and setup was super easy, took about 45 minutes. Results were excellent. Works as advertised.
    Date published: 2018-02-15
    Rated 5 out of 5 by from nice hard product to find nice product, hard to find other places, shipped very quick !
    Date published: 2016-04-09
    Rated 1 out of 5 by from Easy to install, 1 degree of adjustment Title says it all. Mostly stock engine with 16 inches of vacuum, the checked the advance at multiple settings and achieved only 1 degree of timing difference.
    Date published: 2019-05-28
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    Does this vacuum canister have adjustable rate or just degrees?

    Asked by: j08fish005
    This is made to adjust the vacuum in degrees - here is a link to the instructions for more detail. https://www.jegs.com/InstallationInstructions/500/555/555-40003.pdf
    Answered by: Rusty B
    Date published: 2018-12-04

    will this vacuum advance fit my pro billet msd distributor 8361.i dont think that my dist has adjustable vacuum advance

    Asked by: ellie
    This will only fit the original GM HEI distributors.
    Answered by: Rusty B
    Date published: 2018-05-16
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    Some parts are not legal for use in California or other states with similar laws / regulations

    Motor Vehicles

    WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.


    WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.

    Electrical Cords

    WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.