C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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Old Mar 27, 2026 | 10:15 PM
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Sounds like a great improvement! Regarding timing, it does sound a bit backwards that changing your vacuum advance to a ported spot made the engine run smoother. Usually going from 12 degrees to whatever it’s adding would make it better. What are you reading at idle timing wise with the VA plugged in?
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Old Mar 28, 2026 | 08:22 AM
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Originally Posted by Piersonpie
Sounds like a great improvement! Regarding timing, it does sound a bit backwards that changing your vacuum advance to a ported spot made the engine run smoother. Usually going from 12 degrees to whatever it’s adding would make it better. What are you reading at idle timing wise with the VA plugged in?
It is 12 degrees, plugged in or not at idle.
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