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Proform HEI Adjustable Vacuum Advance Fits GM Applications

778-66952C


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HEI Adjustable Vacuum Advance Fits GM Applications
$18.99
2 left in stock
HEI Adjustable Vacuum Advance
  • Fits GM Applications
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    66952C - Proform Adjustable HEI Vacuum Advance is rated 4.7 out of 5 by 3.
    Rated 5 out of 5 by from Ask. Vacuum advance Easy install. The adjustable advance feature allows you to tune advance to your engines specific needs. My fuel mileage increased significantly and low end and part throttle response were increased!
    Date published: 2017-11-08
    Rated 4 out of 5 by from good product for the money I RECENTLY PURCHASED THIS VACUUM ADVANCE FOR THE ADJUSTABLE FEATURE AND IT WORKS GOOD.
    Date published: 2017-09-15
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    Fits gm v-8 hei distributorsReplaces the oe non-adjustable unitAllows you to change the amount of ignition vacuum advance for maximum performance while preventing detonationImproves fuel economy, throttle response, horsepower, and performanceIncludes 3/32" allen wrench and easy-to-follow instructionsJEGS 555-40003 ...
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    Kit Contains 2 Weights, 3 Sets of Springs, 2 Pairs of Nylon Bushings & Special Center Plate. Instuction Sheets with Graphs Showing Typical Advance Rates with Various Spring/Weights are also Included. GM.
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    Note: This product is legal only for off-highway use (except in California or states that have adopted California emission standards), racing use or for use on pre-emission-controlled motor vehicles/motor vehicle engines (pre-1966 domestic vehicles certified to California standards, pre-1968 domestic ...
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