{"product_id":"cnraqr-ls-engine-oil-cooler-bypass-cover-block-off-plate-for-gen-iii-iv-ls-oe-12577903-replacement","title":"CNRAQR LS Engine Oil Cooler Bypass Cover Block Off Plate for Gen III\/IV LS — OE 12577903 Replacement","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThe CNRAQR LS Engine Oil Cooler Bypass Cover is engineered for GM Gen III and Gen IV LS-series small block oil pans where the oil cooler ports sit above the filter. It serves as an upgraded replacement for OE GM part 12577903, offering a clean, bolt-on solution for enthusiasts who bypass or remove the oil cooler in compatible builds. The unit is compact yet robust, designed for a tidy installation that maintains a factory-like appearance while delivering dependable function in everyday driving or track-ready setups.\u003c\/p\u003e\n\u003ch3\u003eMaterials and Design\u003c\/h3\u003e\u003cp\u003eMachined from billet 6061-T6 aluminum and finished in durable black anodize, the bypass cover combines strength with corrosion resistance. The design features a large ported internal cavity and smooth edges to support steady flow characteristics when compared to typical factory die-cast covers. While it does not alter engine specifications, its geometry aims to provide a cleaner oil path under varying speeds and conditions. The included gasket, using high-temperature FKM rubber bonded to aluminum, helps sustain a reliable seal through heat cycles and oil exposure.\u003c\/p\u003e\n\u003ch3\u003eWhat You Get\u003c\/h3\u003e\u003cul\u003e\n  \u003cli\u003e2 LS engine oil cooler bypass covers\u003c\/li\u003e\n  \u003cli\u003e4 zinc-plated mounting screws\u003c\/li\u003e\n  \u003cli\u003e4 plugs\u003c\/li\u003e\n  \u003cli\u003e2 upgraded gaskets\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Benefits in Real-World Use\u003c\/h3\u003e\u003cul\u003e\n  \u003cli\u003eBroad compatibility with GM Gen III\/IV LS oil pans with oil cooler ports above the filter\u003c\/li\u003e\n  \u003cli\u003eSolid billet aluminum construction for a durable, long-lasting component\u003c\/li\u003e\n  \u003cli\u003ePorted internal cavity designed to support smoother flow characteristics\u003c\/li\u003e\n  \u003cli\u003eComplete hardware kit included to simplify installation and reduce extra purchases\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation and Care\u003c\/h3\u003e\u003cp\u003eInstallation is straightforward: position the block-off plate over the oil pan, align with the ports, insert the gasket, and tighten the screws. Clean the mating surfaces, avoid overtightening, and inspect for leaks after the initial startup. The package is designed to deliver a secure, leak-free seal under typical operating conditions.\u003c\/p\u003e\n\u003ch3\u003eSupport and Policy\u003c\/h3\u003e\u003cp\u003eCNRAQR offers a two-month return service. If you have questions during installation or use, contact us for prompt assistance.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What is the CNRAQR LS Engine Oil Cooler Bypass Cover used for?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: This bypass cover blocks the oil cooler ports on GM Gen III\/IV LS engines, replacing OE GM part 12577903.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What comes in the package?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The kit includes 2 bypass covers, 4 screws, 4 plugs, and 2 upgraded gaskets.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"CNRAQR","offers":[{"title":"Default Title","offer_id":42466227126357,"sku":"B0F4XGN7JT","price":34.45,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0632\/3270\/4597\/files\/cnraqr-ls-oil-cooler-bypass-cover.jpg?v=1778042161","url":"https:\/\/plentytorque.co.uk\/products\/cnraqr-ls-engine-oil-cooler-bypass-cover-block-off-plate-for-gen-iii-iv-ls-oe-12577903-replacement","provider":"PlentyTorque","version":"1.0","type":"link"}