Gasket - Engine Block Valley Cover

The gasket for engine block valley cover is a critical sealing component designed for LS2, LS3, and LS7 engines in the GM LS-series family. This gasket prevents oil seepage and coolant intrusion into the valley area between the cylinder heads—a high-pressure, high-temperature zone that demands reliable sealing. Whether you're rebuilding a stock engine, restoring a classic Camaro or Corvette, or modifying a modern LS-powered platform, a quality valley cover gasket is essential to prevent oil leaks that compromise engine cleanliness and longevity.

This gasket combines aluminum and rubber materials, engineered to handle the extreme thermal cycling and vibration inherent to high-performance LS engines. The aluminum substrate provides structural rigidity and heat dissipation, while the rubber sealing surfaces conform to the mating surfaces of the block and valley cover, creating a durable, leak-free barrier. At just 0.38 lbs, the compact design (9.45 x 0.85 x 23.4 inches) fits precisely within the valley pocket without interference, and the dual-material construction resists degradation from oil, coolant, and engine heat better than traditional cork or single-layer gaskets.

Mechanics and engine builders rely on this valley cover gasket during top-end overhauls, head gasket replacements, and full engine rebuilds on Gen III and Gen IV LS platforms. Installation is straightforward: remove the old gasket, clean both mating surfaces thoroughly to bare metal, apply a thin bead of gasket sealant if recommended by your engine manufacturer, and torque the valley cover bolts to specification in a cross pattern. Whether you're running stock LS power or a turbocharged, supercharged, or nitrous-equipped build, this gasket ensures oil stays contained in the crankcase where it belongs.