[J P Stein]

From a story on the build of the "Pooper" to the best of my recollection.

Pete Lovely & crew were running it first time out on the track. They were having problems at speed with the engine running very rough. The carb was semi-exposed to the air flow.
They observed reversion from the carb in the pits while reving the motor.
The fashioned a stack from a paper cup that fit to the top of the carb. End of problem.

Personally, the only time I have observed reversion was on a 2 stroke dirt bike.
I has the air box off, fired the thing off and there is this neat airborne layer of fuel about 1 inch outside the carb.....moving around as I goosed the throttle.
They put that big airbox on there for a reason, I figure.