Pontiac 326 350 389 400 428 455 MID-AIR™ MidRise Aluminum Intake Manifold [Polished] Speedmaster idle air control motor

Speedmaster idle air control motor adapters allow GM-style idle air control motors to be used with throttle bodies originally designed for a different bolt pattern

or hot rod project

Provide safety in the event of too much pressure due to overfilling or heat

Speedmaster has redesigned the power gear sets to incorporate four pinion gears--unlike a stock 3-pinion style--to increase their load-handling characteristics

These gaskets feature superior-quality rubber and steel

Pontiac 326 350 389 400 428 455 MID-AIR™ MidRise Aluminum Intake Manifold [Polished] Speedmaster idle air control motorThe 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.