Chevy BBC 454 Oval Port MID-AIR™ MidRise Aluminum Intake Manifold [Black] Step up to the high-rpm

Step up to the high-rpm power of an open plenum with Speedmaster HiRise intake manifolds

Speedmaster shifters designed to fit most 3 or 4-speed automatic transmissions

let a Speedmaster aluminum Competition series radiator give your high-powered race car the advantage

These Speedmaster 8-71 and 6-71 supercharger manifolds are aluminum constructed and suitable for competition or street use

making them ideal for withstanding the rigors of any demanding environment

Chevy BBC 454 Oval Port MID-AIR™ MidRise Aluminum Intake Manifold [Black] Step up to the high-rpmThe 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.