valve cover confusion

why do the valve covers on circle track motors have two breathers on one side only as opposed to a street or drag motor that has ventiliation on both sides?

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why do the the valve covers on circle track motors have 2 breathers on only 1 cover?
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less chance of oil coming out of the breathers in a turn if they are both on one side, usually the left valve cover.
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Oil would spill out of the breathers on the outside (right side) Wet sump oil pans are also built with this in mind. The sump which holds the majority of the oil and the pickup tube are located on the right side where all the cornering g-forces collect the oil. If the sump where not positioned like that, chances are the oil pump would gulp air during a hard turn. Most likely burning up the bearings. But Winston Cup cars don't use wet sump oiling so they don't have to worry about it.
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