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Brian,
Michael is right. Holley carbs pull secondary vacuum through the high pressure side of the venturi (within the carb) If yours are not opening you need a lighter spring.
What carbs are you using? Where they prepared for a dual quad engine specifically or are they "out of the box" 1850's or similar?
__________________
michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
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