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The "drippers" the seller is referring to may be describing small triangular pieces of metal that were spot welded to the inside top of big block Chevrolet valve covers.
Factory steel valve covers used to have them. They are positioned directly above the rocker arm studs. As the oil splashed around the valve cover, these triangular shapes of metal directed oil to drip onto the rocker arm balls to aid in lubricating them.
These "drippers" are not often present in tall and/or aftermarket valve covers because they interfere with roller rocker arms.
DJS
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