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Reply to "Engine is dieseling badly on shutdown - Seeking advice"

The balancer is aftermarket and brand new.  We checked that the TDC marking on the balancer matched to cylinder #1 at the top of its stroke.

The car is being driven but only for a short distance while sorting things out.  The distance is not long enough to get the fans going.  When the car is stationary I can run it with my hot wire setup and the ignition switch off.  This helps to eliminate electrical issues as the source of the dieseling.  

Vacuum advance is plumbed to the full vacuum port on the Holley carb.

Within a few hours I should be able to try a new carb gasket and/or find a vacuum leak.  

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