It has been so long since I modified mine I could be wrong. But I don't think it was obstructed in any it is the fact that it is a downdraft and the air over it at speed pulls the old air out and the vents in the valve cover let air back in to help scavage more air out.


Ron, The Computer Greek
I love therefore I am.
1954 3100 Chevy truck
In the Gallery
2017 Buick Encore
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1960 MGA Roadster Sold 7/18/2017