Speedmaster 1-147-077 Oldsmobile 400 425 455 MID-AIR™ MidRise Aluminum Intake Manifold Polished

The Speedmaster MID-AIR™ MidRise Aluminum Intake Manifold (Part# 1-147-077) is purpose-built for Oldsmobile 400, 425, and 455 cubic-inch engines, delivering a lightweight aluminum construction with a polished finish that stands out under the hood. The midrise plenum height is engineered to balance strong low-to-mid range torque with improved top-end airflow, making it a versatile performance upgrade for street and strip applications.

The striking polished aluminum surface resists corrosion while giving your engine bay a clean, show-quality appearance. Designed as a direct-fit replacement for compatible Oldsmobile big-block engines, this intake manifold from Speedmaster is an excellent choice for enthusiasts looking to improve throttle response and overall engine efficiency on their classic Olds-powered build.