Edelbrock Part # 75254 RPM Air-Gap Dual-Quad #75254 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. Also available as a complete carb and manifold kit. Will not fit under stock Corvette hood. This manifold offers our long lasting bright chrome like EnduraShine finish that matches chrome and polished accessories.