Pontiac 326 350 389 400 428 455 MID-AIR™ MidRise Aluminum Intake Manifold [Polished] Speedmaster has redesigned the power

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 Speedmaster main bearings are just what you need to freshen up your engine

or hot rod project

enhancing overall performance and efficiency

and then powdercoated or plated for protection and appearance

Pontiac 326 350 389 400 428 455 MID-AIR™ MidRise Aluminum Intake Manifold [Polished] Speedmaster has redesigned the powerThe 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.