I believe he was talking about a bypass valve to let air in after the throttle plate. This vaccum leak should stop air from traveling across the venturi & sucking fuel out the of the jets.
This could potentially cause a lean burning condition, which could be bad for your engine.
I think this can be done with a carb spacer & an electric/air solenoid. The inlet for the solenoid should be after the air filter & the exit should be plumbed into the carb spacer. When the solenoid is opened it shoul allow air to travel around the carb, which should allow for DFCO.
I read about it somewhere on the internet. Someone sells a kit/plans, cant remember, that hooks the solenoid up to all kinds of stuff including your brake light switch. All this is to automate the thing so your engine won't stall. I say just use a momentary switch & your noodle to control it.
Don
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