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A simple lever valve that size shouldn't take any more than one pound of force to operate (probably a lot less). The diameter of the vacuum cylinder is about 1-1/8", meaning that it is about 1 square inch area. So 1 pound divided by 1 square inch = 1 pounds per square inch. That equals about 2 inches of Mercury (in Hg), which is the common unit to measure vacuum.
So the valve should open under 2 inches of vacuum. Your engine, at idle, should generate at least 15.
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