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On my 302 with Holley 2-bbl, I was trying to set the timing using the procedure previously described: Attach gauge to a vacuum source and with engine at idle adjust distributor to achieve maximum vacuum (less one inch). When attaching the gauge to the carb-to-distributor port, I got no reading. I noticed also that the choke tube inlet was sucking air, so I plugged that temporarily. Questions are: (1)where do I attach the gauge to get a good reading, (2) what should it be, and (3) why is the choke tube inlet showing a vacuum?
 

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No disprespect, but manifold vacuum is a legitimate way to find optimal timing. Adjust/rotate dizzy until maximum vacuum is found, test for pinging. If pings, then back off slightly, retest.

It is manifold vacuum, not carb ported vacuum that is required for this.

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Find a port directly off the intake manifold. My C-4 has a transmission vacuum line, off a fitting at the rear of the carb, and it works great for that.

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