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High-end rockers will require a tall set of valve covers like this cast aluminum unit from Edelbrock. It arrives with breather holes already cut in, so you can use a drop-in breather like the one pictured from Moroso. The breather kit comes with rubber grommets to hold the breather in place. Put a breather in the valve cover that will go on the left side of the engine and a grommet plug on the right to keep oil from splashing out in the turns.