Edelbrock RPM Air-Gap 351C Intake Manifold for Ford Cleveland Small-Block V8Edelbrock part #7564 RPM Air Gap 351C intake manifold design utilizes the same race winning technology that's been used on Edelbrock's Victor Series competition intakes for many decades. Designed to improve performance on the street or racetrack, this manifold features an open space that separates the runners from the hot engine oil resulting in a cooler, denser charge. The RPM Air Gap manifold for 351 Cleveland engines is designed to complement