Speedmaster 1-147-078 Oldsmobile 400 425 455 MID-AIR Aluminum Intake Manifold Black

The Speedmaster 1-147-078 is a MID-AIR™ aluminum intake manifold designed for Oldsmobile 400, 425, and 455 cubic inch V8 engines. This mid-rise design features an innovative air gap configuration that separates the plenum chamber from the engine block, allowing cooler ambient air to flow underneath and reduce heat transfer from the engine.

Key Features:

• Air gap design with open area under plenum chamber for reduced heat soak
• Identical plenum and runner design to standard mid-rise manifolds for proven performance
• Cooler intake charge delivers increased power and torque output
• Durable aluminum construction with black finish
• Mid-rise profile balances performance and hood clearance
• Approximately 1.25 inches taller than stock Oldsmobile intake manifolds

The MID-AIR™ air gap technology provides a thermal barrier between the intake manifold and engine heat, resulting in denser air charge and improved combustion efficiency. This design is ideal for street performance and hot rod applications where maximizing power output is a priority. Hood clearance should be verified before installation due to the increased height over stock manifolds.