Edelbrock 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, denser charge and more horsepower. Carb center to carb center is 6-7/16".