Taylormade Posted July 14, 2017 Share Posted July 14, 2017 Okay, the dumb question of the day - what is this threaded hole for on the backside of my BB-1 updraft carb? I thought maybe a vacuum line port, but I have a vacuum line coming off the manifold. Link to comment Share on other sites More sharing options...
maok Posted July 14, 2017 Share Posted July 14, 2017 Yep, vacuum port. Link to comment Share on other sites More sharing options...
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