On my carbs it is the vacuum source the connects to the distributor for vacuum advance. I can send pictures if needed.


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On 12/2/2017 at 7:03 AM, Jeff Berk said:

I got the last two bolts off and noticed that the inside of the intake is very rough. Would smoothing it out and polishing help performance or would it be a waste of time?

i have read that leaving the inside of the intake rough helps keep the fuel mixture mixed a little better. adds a little turbulence.