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....Since vacuum goes away as the engine is loaded, how could one expect the engine to "knock" at full advance?....
Because it diminishes with the load, it does not just "go away" - if there is too much vacuum advance, it will knock as load is increased - tedster - if you are not street driving the car very much, I would just get an aftermarket distributor without vacuum advance - I don't have vacuum advance on any of my hot rods, and I have five of them!!
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