The Edelbrock 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. They do not compress well when used with an aluminum intake manifold. The factory composition-type embossed gasket also works satisfactorily. It is intended for high-performance street or competition engines that run from 1, 500 to 6, 500 RPM. It delivers maximum power with a broad torque curve for high-performance street applications. This manifold has provisions to add oil fill tube but no provisions for exhaust heated or stock-style choke.