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A racing engine is either on or off, so it doesn't really matter. Years ago I made a restricter plate for a water cooled supervee. I made the holes eccentric to the inlets, it worked well but I worried about the excess fuel pooling in the trumpets, upstream of the restricter plate. I remade the plate, offsetting the holes so that their was a smooth path at the bottom of the inlet tract. Driver complained so I put the old one back!
I must have blundered on a way of richening the mixture just when it was needed, when the throttle was snapped open.
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