So, for anyone with specific 660 holley carb experience, in the below picture (just a pic from Google), #1 is where my vacuum port nipple is. #2 is tapped but doesn't appear to go anywhere. One of my carbs has a plug screwed in, the other is empty. Does anyone know if there is both ported and manifold vacuum ports on these? or can #2 be opened up somehow to have ported vacuum?
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