Edelbrock part #2604 Performer Air-Gap intake manifold is designed for 1987-95 cast iron heads with canted center bolt holes small-block Chevys. 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. Fits spread-bore or square-bore carburetors. Will not fit under stock Corvette hood.