I haven't really questioned the use of the ball before, but looking at the diagrams it appears that the ball/seat has to provide a controlled leak and not a positive seal. Looks like only way for vacuum to pull up the diaphragm is leakage past the check ball? Guess without the ball the movement of the diaphragm would be both too quick and erratic?
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 Catalina Safari Wagon.
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