Chevy BBC 454 Oval Port MID-AIR™ MidRise Aluminum Intake Manifold [Black] short block engines are the

short block engines are the solution to a hassle-free power build

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

a C5 Corvette hub bearing pack

making them ideal for withstanding the rigors of any demanding environment

Chevy BBC 454 Oval Port MID-AIR™ MidRise Aluminum Intake Manifold [Black] short block engines are theThe 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.