Edelbrock part #28457 Victor JR. LS3 intake manifold is designed for Gen IV LS engines equipped with LS3, L92 and L76 cylinder heads. This manifold is for carbureted racing applications operating between 3500-7500 rpm. This manifold uses a standard square bore carb flange that is compatible. The LS3, L92 and L76 all use the same cylinder head.