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We ran a Nissan A14 engine in GT-4 about 15 years ago. We had a very long duration cam and would see the reversion about 2 inches out side of the velocity stacks at 10,000 rpm. It looks like a cloud that just hangs near the inlet. We fashioned our airbox to allow for this.
I am running stock cams so I do not expect this to be an issue now that i have stopped to think about it.
On a side note there is a guy on ebay that is selling main jets for the Zenith. I just ordered 18. I have bought carbs from him in the past. Should be here in a couple of weeks.
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