525 Valve Cover Breathers ( SOLD AS A SET )(NOTE: This is one front and one back) What is a Velocity stack

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525 Valve Cover Breathers ( SOLD AS A SET )(NOTE: This is one front and one back) What is a Velocity stackThe common misconception about valve cover breathers, is the filter media used in your most common breathers is for filtering air into the engine. This is false. The motor experiences constant blow by, therefore, constant pressure is being emitted from the crank case. As your "filter" clogs up with oil & dirt during racing conditions, the rate at which the engine can relieve the constant pressure slows down. Increased crank case pressure puts pressure

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