2. The most common way to accurately determine the amount of centrifugal advance a particular distributor provides is to use professional distributor-testing equipment. Finding a shop with a fully functional unit isn’t always a convenient option, however. Would you believe you can accurately determine just how much centrifugal advance your fully assembled Pontiac distributor provides using a common 6-inch protractor purchased for $2 or less from your nearest office supply or grocery store? Read on! We’ll explain how.