High-Rise Dual-Plane Engine Intake Manifold, designed for 1957–1986 SBC Chevy V8 engines (305, 327, 350, 400). This aluminum dual-plane, 180° street manifold is compatible with Holley, Carter AFB, and Edelbrock square flange carburetors and operates in the 1,500–6,500 RPM range. It features intake gasket ports measuring 1.23" W x 1.99" H, dual distributor hold-downs, and accepts HEI distributors. With a larger-than-stock plenum and runners, it supports bigger engines, enhances RPM potential, and provides power comparable to single-plane manifolds while maintaining the throttle response and drivability of a dual-plane design. No provisions for stock oil fill tubes or exhaust-heated chokes, and it will not fit under Corvette hoods.