The Edelbrock Performer RPM Intake Manifold is the network of passages that direct air or air-fuel mixture from the throttle body to the intake ports in the cylinder head. It is designed especially for spread-bore carburetors but also works with the Edelbrock square-bore carburetor without adapter. The Performer RPM intake manifolds have a high-rise, dual-plane layout, with patented runner tuning and a 180 degree firing order. The Performer RPMs have larger plenums and runners to match the free-flowing exhaust, high-lift cams, and other modifications of a high-output engine. The factory composition-type embossed gasket also works satisfactorily. They are intended for high-performance street or competition engines that run from 1, 500 to 6, 500 RPM. They produce incredible top-end horsepower. It delivers maximum power with a broad torque curve for high-performance street applications. This manifold has no provisions for exhaust heated or stock-style choke.