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Michigan Motorsports LS Valley Cover Gasket - Fits 1997-2007 Gen 3 LS Engines - Replacement Gasket for LS1 LS6 LM7 LQ4 LQ9 LR4 - Replaces 12558178

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Product details

Management number 215274736 Release Date 2026/04/12 List Price US$13.20 Model Number 215274736
Category

The Michigan Motorsports Gen 3 LS Valley Cover Gasket is a direct-fit replacement gasket for 1997–2007 GM Gen III LS engines, offering long-lasting reliability and OEM-quality sealing. Designed to replace GM part number 12558178, this gasket features a molded rubber construction with a precision bead that conforms to the engine valley cover and block surface, ensuring leak prevention and consistent oil sealing. Perfect for use during camshaft installations, valley cover upgrades, or engine reseals, this gasket fits a wide range of Gen 3 LS engines found in cars, trucks, and SUV platforms. It’s an essential part of any LS rebuild, maintenance project, or swap.

  • Precision Molded Valley Cover Gasket for Gen 3 LS Engines – Designed to provide a reliable, leak-free seal between the valley cover and engine block on all 1997–2007 Gen III LS platforms.
  • OEM Fit and Function – Direct Replacement for GM 12558178 – Manufactured to meet or exceed OEM specifications, this gasket offers a perfect fit and excellent durability for stock and performance engine builds.
  • Durable Rubber Construction with Molded Bead Sealing – Made from high-quality rubber with an integrated sealing bead, ensuring long-lasting oil resistance, proper sealing, and resistance to heat and vibration.
  • Compatible with Multiple LS Gen 3 Applications – Fits a wide range of LS-based iron and aluminum blocks, including LS1, LS6, LM7, LQ4, LQ9, LR4, and more.
  • Ideal for Engine Rebuilds, Cam Swaps, or General Maintenance – Whether you're doing a valley cover reseal, camshaft upgrade, or replacing a leaking gasket, this is a must-have component for proper LS engine maintenance.
Color Natural
Brand Name Michigan Motorsports
Manufacturer Michigan Motorsports
Material Type Aluminum

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