Edelbrock part #26011 Performer Air-Gap intake manifold compatible with 1955-1986 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 throughout the power band. The great looks of the Performer Air-Gap along with the solid idle to 5500 rpm performance makes this an ideal choice for street rods and street machines. No provision for exhaust heated chokes or exhaust crossover. Fits spread-bore or square-bore carburetors. Will not fit under stock Corvette hood.