{"product_id":"michigan-motorsports-ls-valley-cover-gasket-gen-3-ls-engine-replacement-1997-2007-ls1-ls6-lm7-lq4-lq9-lr4","title":"Michigan Motorsports LS Valley Cover Gasket – Gen 3 LS Engine Replacement (1997–2007) LS1\/LS6\/LM7\/LQ4\/LQ9\/LR4","description":"\u003ch2\u003eDirect-fit replacement for Gen 3 LS engines\u003c\/h2\u003e\n\u003cp\u003eThe Michigan Motorsports Gen 3 LS Valley Cover Gasket is designed to replace GM part 12558178 with a modern, durable seal. Made from molded rubber with an integrated sealing bead, it creates a consistent oil seal between the valley cover and the engine block across 1997–2007 Gen III LS platforms. This gasket is built to perform under the heat and vibration common in daily driving and performance applications.\u003c\/p\u003e\n\n\u003ch3\u003eKey design features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003ePrecision molded rubber with an integrated sealing bead for reliable sealing.\u003c\/li\u003e\n  \u003cli\u003eOEM-grade replacement that matches or exceeds factory specifications for stock and performance builds.\u003c\/li\u003e\n  \u003cli\u003eDirect replacement for GM 12558178, ensuring a familiar fit during maintenance or rebuilds.\u003c\/li\u003e\n  \u003cli\u003eDesigned to resist oil exposure, heat, and vibration over the long term.\u003c\/li\u003e\n  \u003cli\u003eCompatible with a wide range of LS Gen 3 blocks, including iron and aluminum variants.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIdeal uses and real-world scenarios\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eCamshaft installations where a reseal is recommended to prevent leaks during upgrades.\u003c\/li\u003e\n  \u003cli\u003eValley cover upgrades or gasket replacements as part of an engine reseal or rebuild.\u003c\/li\u003e\n  \u003cli\u003eMaintenance in cars, trucks, and SUVs powered by Gen 3 LS engines in the 1997–2007 era.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation tips and notes\u003c\/h3\u003e\n\u003cp\u003ePrepare the mating surfaces by cleaning thoroughly and inspecting for damage. Install with even pressure and follow torque specs for valley cover bolts. This gasket is designed for a straightforward swap on compatible engines and aims to reduce rework from oil leaks.\u003c\/p\u003e\n\n\u003ch2\u003eWhy choose Michigan Motorsports\u003c\/h2\u003e\n\u003cp\u003eOur gasket emphasizes dependable sealing and factory-quality materials without complicating your rebuild. While performance outcomes can vary by overall engine condition and installation quality, this part is built to support reliable operation and easier maintenance in Gen 3 LS builds.\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: Which engines is this gasket compatible with?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Fits 1997–2007 Gen 3 LS engines, including LS1, LS6, LM7, LQ4, LQ9, and LR4.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this replace GM part 12558178?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, it is a direct-fit replacement for GM 12558178 and matches OEM specs.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Michigan Motorsports","offers":[{"title":"Default Title","offer_id":42470318473301,"sku":"B0BPJPHMNQ","price":48.7,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0632\/3270\/4597\/files\/michigan-motorsports-ls-valley-cover-gasket-closeup-1.jpg?v=1778129233","url":"https:\/\/plentytorque.co.uk\/products\/michigan-motorsports-ls-valley-cover-gasket-gen-3-ls-engine-replacement-1997-2007-ls1-ls6-lm7-lq4-lq9-lr4","provider":"PlentyTorque","version":"1.0","type":"link"}