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Product ID: MBR0015
Valve Cover Breather
Valve Cover Breather
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Valve Cover Breather

Fits aftermarket valve covers using 1 5/16"-12 screw-in thread, including Holley LS covers (shown)

This valve cover breather assembly replaces the original oil cap included with many popular aftermarket valve covers.  The base is CNC-machined from billet aluminum for precise fit, and the included silicone O-ring 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, which is securely retained in the filter base by a specially-machined retention groove in 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 may reduce the effectiveness of the vehicle's PCV system, and it is not emissions-legal.

Note:  Image 3 shows this breather installed on Holley's cast valve covers for the GM LSx application.  Please confirm fitment on other valve covers prior to ordering.

 
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Price: $46.99

 
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