Pontiac 326 350 389 400 428 455 MID-AIR™ MidRise Aluminum Intake Manifold [Polished] It is similar to our

It is similar to our LowRise

Keep your camshaft from wandering with Speedamster camshaft thrust plates

These Speedmaster aluminum crankshaft pulleys help to increase horsepower by reducing accessory drag

Tune your rpm-activated control to your application with one of these Speedmaster rpm module kits

Pontiac 326 350 389 400 428 455 MID-AIR™ MidRise Aluminum Intake Manifold [Polished] It is similar to ourThe 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.