Speedmaster®
Pontiac 326 350 389 400 421 428 455 HiRise Aluminum Intake Manifold [Polished]
![Speedmaster® 1-147-092 Pontiac 326 350 389 400 421 428 455 HiRise Aluminum Intake Manifold [Polished]](https://product-arena.s3.us-west-1.amazonaws.com/Speedmaster/1-147%20Intake%20Manifolds%2C%20Carbureted/1-147-092/1-147-092.jpg?resizeid=224&resizeh=600&resizew=600)
![Speedmaster® 1-147-092 Pontiac 326 350 389 400 421 428 455 HiRise Aluminum Intake Manifold [Polished]](https://product-arena.s3.us-west-1.amazonaws.com/Speedmaster/1-147%20Intake%20Manifolds%2C%20Carbureted/1-147-092/1-147-092_A.jpg?resizeid=224&resizeh=600&resizew=600)
![Speedmaster® 1-147-092 Pontiac 326 350 389 400 421 428 455 HiRise Aluminum Intake Manifold [Polished]](https://product-arena.s3.us-west-1.amazonaws.com/Speedmaster/1-147%20Intake%20Manifolds%2C%20Carbureted/1-147-092/1-147-092_B.jpg?resizeid=224&resizeh=600&resizew=600)
![Speedmaster® 1-147-092 Pontiac 326 350 389 400 421 428 455 HiRise Aluminum Intake Manifold [Polished]](https://product-arena.s3.us-west-1.amazonaws.com/Speedmaster/1-147%20Intake%20Manifolds%2C%20Carbureted/1-147-092/1-147-092_C.jpg?resizeid=224&resizeh=600&resizew=600)
Product Information
Overview
This manifold is a single plane manifold that will fit under all Pontiac hoods including the Trans-Am "Shaker" hood. It accepts a stock Quadrajet carb but we also include an adapter plate for standard square bore carbs. This manifold is designed to work with cylinder heads up to 300 CFM. It is also available machined for injectors.
Specs
| Brand: | Speedmaster |
| Part Number: | 1-147-092 |
| Part Type: | Intake Manifold, Carbureted |
| Product Line: | HiRise |
| Engine Block Style: | Stock/OEM standard deck |
| Carburetor Quantity: | One |
| Intake Style: | Single plane |
| Basic Operating RPM Range: | 3,000-7,500 |
| Intake Manifold Height: | Stock |
| Intake Material: | Aluminum |
| Intake Finish: | Machine Polished |
| EGR: | No |
| Quantity: | Sold individually. |
| Notes: | Will fit Trans Am shaker-style hood. |
Description
Warranty Information
12-Month Limited Worldwide Warranty
Prop 65 Warning
This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
Installation Guide
Our AI assistant generates a step-by-step guide for this product — covering installation, maintenance, and troubleshooting.
This AI-generated guide is for general reference only and does not constitute official Speedmaster product documentation. Always verify fitment, torque specifications, and safety requirements before installation.