Aeroflow Performance cast aluminium LS1 valley plate is perfect for those that have been converted from EFI to Carburetted applications. This valley plate does not feature any provision for the knock sensor which become no longer necessary when switching to a carburettor application or when moving to a dual knock sensor setup on EFI applications. Designed to be low profile that will eliminate any fitment issues with factory and aftermarket intakes and still take the factory gasket which is included in the is kit. They can be used on factory and aftermarket GM LS1 style engine blocks. Will not fit Gen 4 Engine Blocks (LS3, LS7, or blocks with Active Fuel Management (AFM), DOD). Available in either a finned or trussed style design in both natural cast and black finish. Each valley plate includes a new gasket and new mounting bolts.