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![Speedmaster® 1-147-078 Oldsmobile 400 425 455 MidRise Air Intake Manifold [Black]](https://product-arena.s3.us-west-1.amazonaws.com/Speedmaster/1-147%20Intake%20Manifolds%2C%20Carbureted/1-147-078/1-147-078_A.jpg)
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![Speedmaster® 1-147-078 Oldsmobile 400 425 455 MidRise Air Intake Manifold [Black]](https://product-arena.s3.us-west-1.amazonaws.com/Speedmaster/1-147%20Intake%20Manifolds%2C%20Carbureted/1-147-078/1-147-078_C.jpg)
Speedmaster®
Oldsmobile 400 425 455 MidRise Air Intake Manifold [Black]
Overview
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.
Specs
| Brand: | Speedmaster |
| Part Number: | 1-147-078 |
| Part Type: | Intake Manifolds, Carbureted |
| Product Line: | MidRise Air |
| Engine Block Style: | Stock/OEM standard deck |
| Carburetor Quantity: | One |
| Intake Style: | Single plane with divider |
| Basic Operating RPM Range: | 1,500-6,500 |
| Intake Manifold Height: | 6.500 in. |
| Intake Material: | Aluminum |
| Intake Finish: | Black |
| EGR: | No |
| Quantity: | Sold individually. |
| Notes: | Manifold is 1.25 in. taller than stock. |
| Calculator: | CFM Calculator |
Description
NOTE: Hood clearance must be checked as this manifold is approximately 1.25" taller than a similar stock intake manifold.
Prop 65 Warning
This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.