Edelbrock 7525 Performer RPM AIR-Gap Dual-Quad Intake Manifold for Small Block ChevyPerformer RPM AIR Gap Small Block Chevy Dual Quad Intake Manifold Edelbrock part #7525 RPM Air Gap dual quad intake manifold is designed for 1955 86 S B Chevys, this intake stands 1 5 8" taller than the low profile C 26 intake and offers 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. Will not fit under stock