Chevy SBC 350 1957-95 MID-AIR™ MidRise Aluminum Intake Manifold [Satin] The Speedmaster LowRise Manifolds are

The Speedmaster LowRise Manifolds are our lowest profile manifold and is also the only one that is street legal on pollution controlled vehicles

The air flowing under the plenum provides a cooler charge for the incoming air with less heat transfer from the engine

Manufactured with lightweight aluminum technology

aluminum and 100 percent pressure- tested to eliminate leak

Chevy SBC 350 1957-95 MID-AIR™ MidRise Aluminum Intake Manifold [Satin] The Speedmaster LowRise Manifolds areThe Speedmaster MidRise Air design features the identical plenum and runner design as the normal MidRise. The main difference is that there is an open area under the plenum chamber. This feature is sometimes called an air gap design. The air flowing under the plenum provides a cooler charge for the incoming air with less heat transfer from the engine. This cooler air charge provides additional power and torque.