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Old Mar 12th, 09, 02:36 PM
Big Dave Big Dave is offline
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Default Re: Okay need a vacuum advance question answered

The ported vacuum is only used for emission cars that have to pull out as much timing as possible at idle to keep the NOX numbers down (later ignition lowers the compression pressure and temperature). Muscle cars from the late sixties used vacuum off the manifold teed into the power brake booster back before carbs started sprouting more vacuum taps than an octopus (of course back then you had to pay extra to get an electric choke too).

Big Dave
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