Seal up your engine while looking good with one of these ICT Billet LS lifter valley covers. They are designed to fit Gen III (Non-DoD) engines and are milled from a solid block of aerospace-quality billet aluminum. The covers offer outstanding block rigidity, while the precision-machined underside provides an excellent seal using the existing factory O-ring. Their wide chamfered edges ensure adequate intake manifold runner clearance and they include the necessary flush mount, Allen head stainless steel mounting hardware. Valley cover deletes knock sensor and will not fit LS3/LS7 or blocks using Active Fuel Management.. Gasket is not included. Use gasket part number NAL-12558178 or equivalent.