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

The Speedmaster Oldsmobile 400 425 455 MID-AIR MidRise aluminum intake manifold (MPN 1-147-077) is a performance-focused intake solution engineered for these classic Oldsmobile big-block engines. Constructed from durable polished aluminum, this manifold delivers a factory-style fit while offering modern performance benefits and a refined aesthetic. The MidRise design balances torque delivery across the RPM range, making it ideal for street and mild performance applications.

This intake manifold is compatible with Oldsmobile 400, 425, and 455 cubic-inch engines, providing a direct bolt-on upgrade path for restoration and performance builds. The polished aluminum finish resists corrosion and delivers a professional appearance in the engine bay. Whether you're restoring a classic Oldsmobile or enhancing an existing engine platform, this Speedmaster manifold combines proven engineering with straightforward installation.

Key Features & Benefits

• Polished Aluminum Construction: Durable polished aluminum resists corrosion and delivers a refined, show-quality appearance.
• MID-AIR MidRise Design: MidRise profile optimizes torque delivery and performance across the RPM band.
• Oldsmobile Big-Block Compatible: Direct-fit for Oldsmobile 400, 425, and 455 cubic-inch engines.
• Factory-Style Fit: Engineered for straightforward bolt-on installation without modification.

Specifications

Ideal Applications

• Classic Oldsmobile engine restoration and rebuild projects
• Performance street builds on big-block Oldsmobile platforms
• Engine bay upgrades seeking improved aesthetics and thermal management
• Direct replacement for deteriorated or stock intake manifolds