The Cyclone low profile manifold is good for a small block or big block Chevy. The small block dual-plane intake builds power from idle to 5500RPM and the big block intake has a 1500-6500RPM powerband. These street manifolds accept square-bore carbs. NOTE: It also comes in triple chrome plated at an additional cost. The Cyclone Plus has all the features above including a 3/8 taller carburetor flange.