Edelbrock SBC Perf Air Gap Manifold PolishedEdelbrock part #26011 Performer Air Gap intake manifold Designed for 1955 86 262 400 c. i. d. small block Chevys. The Performer Air Gap intake manifold features the air gap design for the ultimate street performance in the idle to 5500 rpm range. This design features an open air space that separates the runners from the hot engine oil resulting in a cooler, denser charge for more power. High velocity runners deliver excellent throttle response