Edelbrock 7551 RPM Air-Gap Intake Manifold for Oldsmobile 455Edelbrock RPM Air Gap Oldsmobile 455 Intake Manifold Edelbrock part #7551 Performer RPM Air Gap Oldsmobile 455 intake manifold is intended for aggressive street strip big block Oldsmobile applications. Designed to optimize horsepower production from 1500 to 6500 rpm, this manifold will perform best with engines that have an aggressive camshaft profile that will take advantage of the increased flow this manifold can provide. This intake manifold