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I know on a holley the secondary diafram makes up the gasket. there should be a spring in there to counter the vacuum untill there is enough pressure to open them

68 fastback, 390 4V premium fuel
80 5.0 hatch, just finished
91 5.0 coupe, daily driver
84 RamCharger 4x4 extreme mudsliger and winter junker
 
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