I've found that it depends on the cam thats in the car weather to use ported or MVA , I use & have always used MVA with my RAIV cam. If I used a different cam again depends on the cam you can sometimes use ported vac. But not very often. With the engine I have now I use MVA at 26 at 2800 rpms. For mine thats what works best in mine. At least right now.
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