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Q:my car is running fine but I am doing upgrades.will I need to reset my timing when I install the new vacuum?
A:Hi Tal, I'm glad to help you! Here is the link to the installation instruction of this vacuum advance kit #31035, you can take a look on that for more information about the adjustment of the vacuum advance chamber.
Q:what is the function
A:Vacuum advance is needed because as your rpm goes up your ignition needs to fire sooner to compensate for the increased speed of the engine. Remember if you need to set the timing do it with the vacuum line to the distributor removed and plugged. Do not forget to hook it back up when your done.