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Interesting question. I'm like Bandit, the absolute vacuum of a intake is immaterial, the key is that both intakes have the same vacuum. I have probably done 10 or so syncs, and have never really looked at where the numbers were. Lots of variables to contend with too. Engine speed, atmospheric pressure, gage accuracy, and tongue position. I think I remember between 10 and 20 in Hg on my Morgan Carbtune, but have really not paid much attention to that.
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