Speedmaster 1-147-078 MidRise Air Intake Manifold Blk for OM 400 425 455

Oldsmobile 400 425 455 MidRise Air Intake Manifold Black The 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. NOTE: Hood clearance must be checked as this manifold is approximately 1.25" taller than a similar stock intake manifold. Open area under the plenum chamber "air gap" design. The cooler air charge provides additional power. Cast from steel molds for a tighter grain and reduction of porosity Pressure tested to ensure maximum performance