Speedmaster 1-147-073 Pontiac 326 350 389 400 421 428 455 MidRise Air Intake Manifold Satin
746-1-147-073
![1-147-073 Pontiac 326 350 389 400 421 428 455 MidRise Air Intake Manifold Satin 1-147-073 Pontiac 326 350 389 400 421 428 455 MidRise Air Intake Manifold Satin](http://www.jegs.com/images/photos/700/746/746-1-147-073.jpg)
![](http://www.jegs.com/images/mini/700/746/746-1-147-073.jpg)
![](http://www.jegs.com/images/mini/700/746/746-1-147-073_2.jpg)
![](http://www.jegs.com/images/mini/700/746/746-1-147-073_3.jpg)
![](http://www.jegs.com/images/mini/700/746/746-1-147-073_4.jpg)
Speedmaster 1-147-073 Features:
This is an outstanding manifold for high performance street Pontiac engines. Unlike similar competitive manifolds, the MidRise Air from Speedmaster allows unlimited ambient air-flow under the plenum and around the runners which helps create a cooler incoming air/fuel charge which produces additional power.. 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.
- Open area under the plenum chamber "air gap" design.
- The cooler air charge provides additional power.
- Cast from steel molds for a tighter grain and reduction of porosity
- Pressure tested to ensure maximum performance
Emissions Note:
This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.
CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART
Specifications:
What is the RPM range for this intake?
Motor Vehicles
WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.
Tools:
WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.
Electrical Cords
WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.