The Edelbrock Super Victor LS3 #2821 intake manifold is designed for Gen IV LS engines equipped with LS3 cylinder heads, this new Super Victor intake manifold is ideal for anyone building a 700+ hp 4500 series carbureted large displacement racing engine operating between 3,500 - 7,500 rpm. This new Super Victor intake manifold is designed with 24% larger runners than our Victor Jr. #28457 along with a larger 4500 style plenum. The large plenum makes these intake manifolds ideal for nitrous and forced induction applications. They also feature tapered runners for increased flow at high rpm. The Super Victor 4500 series manifolds can accommodate bores up 2.25". A carburetor mounted style throttle bracket is recommended.