Edelbrock RPM Air-Gap Dual-Quad Manifold for Small-Block Ford 289-302Edelbrock part #7535 RPM Air Gap Dual Quad is designed for 289 302 347 c. i. d. small block Fords. This is a dual plane intake manifold which combines dual four barrel excitement with a well mannered street manifold. This intake is taller than the low profile F 28 intake and offer performance improvements in the 1500 6500 rpm range. The large runners feature our unique Air Gap design that separates the runners from the hot engine valley for a cooler,