This valve cover breather assembly replaces the original oil fill tube found on the factory passenger side valve cover.
The base is CNC-machined from billet aluminum for precise fit, and the included silicone gasket is specially designed to prevent oil seepage at the base of the breather.
The filter base is microfinished for surface protection and good looks, and is easily hand-polished to a mirror-like appearance.
The removable filter element is a high-quality reusable unit from S&B Filters, and it is securely retained in the filter base by a specially machined retention groove at the top of the base.
The purpose of this valve cover breather is to vent unwanted accumulation of pressure in the crankcase, and to provide maximum circulation of ambient air in the crankcase to reduce oil temperatures.
The installation of this breather will contribute to increased engine oil life and reduce the possibility of failed engine seals resulting from excessive crankcase pressure.
This breather will reduce the effectiveness of the vehicles PCV system, and it is not emissions-legal.
The included check valve will allow the breather to vent any crankcase pressure that accumulates, but it will not allow ambient air to be drawn back into the engine through the breather under high-vacuum conditions. This valve is beneficial for applications that retain a valve cover vent line, or applications with a very sensitive (or aggressively-lean) PCM calibration.