{"product_id":"billet-aluminum-valve-cover-breather-assembly","title":"Billet Aluminum Valve Cover Breather Assembly","description":"The Metco Motorsports MBR0003 is a billet aluminum valve cover breather assembly engineered to replace the factory oil fill tube on compatible LSx, LT1 \u0026amp; LT4, 1989 Turbo Trans Am, Ecotec, and 3800 Series II engines, all starting from 1997. The base is CNC-machined for a precise fit, and a specially designed silicone O-ring prevents oil seepage.\n\nThe primary function of this valve cover breather is to vent unwanted crankcase pressure. By doing so, it helps eliminate pumping losses and reduce oil temperatures, which contributes to increased engine oil life and minimizes the risk of engine seal failure due to excessive pressure. A key feature is the included check valve, which allows crankcase pressure to escape while preventing ambient air from being drawn back into the engine during high-vacuum conditions. This is particularly beneficial for applications that retain a valve cover vent line or have sensitive PCM calibrations.\n\nInstallation considerations vary. On LSx engines, it can replace the OEM oil cap on the factory oil fill tube, potentially allowing the retention of the factory engine cover if hood clearance permits. Alternatively, it can be installed directly into the valve cover for a cleaner appearance, though this may interfere with the engine cover. Early LS valve covers with a single locating tab may allow slight rocking, which is functionally insignificant. This product cannot be shipped to California and is not emissions-legal.","brand":"Metco Motorsports","offers":[{"title":"Default Title","offer_id":52689067344184,"sku":"MBR0003","price":79.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/687380291.jpg?v=1784901265","url":"https:\/\/store.motormia.co\/products\/billet-aluminum-valve-cover-breather-assembly","provider":"MOTORMIA","version":"1.0","type":"link"}