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Chevrolet Performance lifter valley covers are designed as direct replacements for the factory originals. These covers are made using top-quality aluminum and are offered for a variety of applications. When you're putting together your LS build, or replacing a damaged piece, Chevrolet Performance Parts lifter valley covers are just what you need for a job done right. Engine block valley cover for Gen IV Small-Block (without Active Fuel Management). Kit includes aluminum cover, bolts, gasket and O-rings.