Speedmaster 1-147-077 MidRise Air Aluminum Intake Manifold, Polished

The Speedmaster 1-147-077 MidRise Air intake manifold is a polished aluminum engine intake manifold for Oldsmobile 400, 425 and 455 engines. It uses the same plenum and runner design as the standard Speedmaster MidRise, with an added open area beneath the plenum chamber.

Key Features:

• Air gap design with an open area under the plenum chamber
• Air flowing under the plenum provides a cooler incoming charge with less heat transfer from the engine
• Cooler air charge helps deliver additional power and torque
• Plenum and runner design identical to the standard MidRise manifold
• Polished aluminum finish

Installation note: This manifold is approximately 1.25 inches taller than a similar stock intake manifold, so hood clearance must be checked before installation.