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Old 06-14-2010, 12:23 PM
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70 Pontiac 400 4BBL

Can some one tell me if this engine used ported or manifold vacuum for ignition advance? I am not sure what year Pontiac switched to ported advance.


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Old 06-14-2010, 06:22 PM
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If the catalyst is still present it will say disconnect vac advance when setting the base timing which means it uses manifold advance. However if the catalyst is absent, then I would try them both and stick with the one it ran better with. My guess would be it uses manifold vacuum.
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Old 06-14-2010, 06:29 PM
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Originally Posted by DoubleVision
I would try them both and stick with the one it ran better with. My guess would be it uses manifold vacuum.
Second that.
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