My Combo, Manifold Or Ported VAC Advance, We'll See...
Sam,
If mileage is the goal, then there will be little difference between PVA & MVA. MVA will give a smoother idle, more vacuum, run cooler at idle & have better tip-in response [ this is based on comparing idle timing after adding MVA...with the stock ign timing ].
And I can tell you from years of experience, your engine will want AT LEAST 30* [ probably more ] for best idle. MVA is one way of providing that. Beware of the bullshit in another post.
Sam,
If mileage is the goal, then there will be little difference between PVA & MVA. MVA will give a smoother idle, more vacuum, run cooler at idle & have better tip-in response [ this is based on comparing idle timing after adding MVA...with the stock ign timing ].
And I can tell you from years of experience, your engine will want AT LEAST 30* [ probably more ] for best idle. MVA is one way of providing that. Beware of the bullshit in another post.