SPEEDMASTER 1-148-002 Gm Downdraft Stack Intake Manifold

( Brand: Speedmaster ), ( Mounting Style: Bolt-on ), ( Type: Intake Manifold ), ( Manufacturer Warranty: 1 Year ), ( Color: Silver ), ( Manufacturer Part Number: 1-148-002 ), ( Features: Polished ), ( Material: Aluminum ), ( Fuel Type: Gasoline )

Review SPEEDMASTER Chevy Gm Downdraft Stack Intake Manifold System Complete Polished fits LS3 EFI

The Speedmaster 1-148-002 Chevy GM LS3 Downdraft EFI Stack Intake Manifold is a high-performance component designed specifically for the LS3 engine. This intake manifold is engineered to provide improved airflow and fuel distribution, making it an excellent choice for enthusiasts seeking superior engine performance.

The manifold is constructed from aluminum, which not only reduces weight but also dissipates heat effectively. Its compact design allows for a more balanced distribution of air and fuel to each cylinder, ensuring optimal combustion and increased horsepower.

One of the most notable features of the Speedmaster 1-148-002 intake manifold is its downdraft design. This layout brings the runners closer to the valley, allowing for a shorter intake tract length and reducing turbulence. As a result, the engine can breathe more efficiently, leading to improved power and torque.

This intake manifold is designed to work seamlessly with Chevy's EFI (Electronic Fuel Injection) system. It comes equipped with six fuel injectors and six throttle bodies, allowing for precise fuel delivery and control. The manifold is also compatible with the factory LS3 engine harness, simplifying the installation process.

The Speedmaster 1-148-002 Chevy GM LS3 Downdraft EFI Stack Intake Manifold is not only a performance upgrade but also a stylish one. Its polished finish adds a touch of elegance to any engine bay, making it a popular choice among car enthusiasts.

In summary, the Speedmaster 1-148-002 Chevy GM LS3 Downdraft EFI Stack Intake Manifold is a high-performance, stylish, and efficient component designed to enhance the capabilities of the LS3 engine. Its downdraft design, aluminum construction, and compatibility with GM's EFI system make it an excellent choice for those seeking superior power and torque from their engine.

Pros and Cons of Buying a Chevy LS3 Downdraft EFI Stack Intake Manifold (Speedmaster 1-148-002) for Your Performance Project

The Chevy LS3 engine is renowned for its power and reliability, making it a popular choice for performance enthusiasts. Upgrading the intake manifold is a common modification to enhance the engine's performance. One such intake manifold is the Speedmaster 1-148-002, a downdraft EFI stack design. In this article, we will discuss the pros and cons of purchasing this intake manifold for your performance project.

1. Increased Power: The primary reason for upgrading to a performance intake manifold is the potential power gain. The Speedmaster 1-148-002 is designed to provide better airflow and improved fuel distribution, resulting in increased horsepower and torque.

2. Improved Fuel Efficiency: The EFI stack design allows for better fuel atomization, which results in more complete combustion. This not only increases power but also improves fuel efficiency.

3. Enhanced Appearance: The intake manifold is a visible component under the hood, and the Speedmaster 1-148-002's polished aluminum finish adds a touch of sophistication and visual appeal to your engine bay.

4. Flexibility: The downdraft design allows for the use of various fuel injectors, including high-performance units, providing flexibility for future upgrades.

1. Complexity: Installing a performance intake manifold, especially one with an EFI stack design, requires a higher level of expertise and experience compared to a standard intake manifold. This could result in additional installation costs or the need for professional help.

2. Cost: The Speedmaster 1-148-002 is priced higher than standard intake manifolds due to its advanced design and features. This could be a significant investment for some performance enthusiasts.

3. Potential Fitment Issues: While the Speedmaster 1-148-002 is designed to fit various applications, there may be some compatibility issues with specific engine configurations or vehicle models. It's essential to verify the intake manifold's compatibility with your engine and vehicle before purchasing.

The Speedmaster 1-148-002 Chevy LS3 downdraft EFI stack intake manifold offers several advantages, such as increased power, improved fuel efficiency, enhanced appearance, and flexibility. However, it also comes with some disadvantages, including complexity, cost, and potential fitment issues. If you are a serious performance enthusiast, the benefits may outweigh the drawbacks. However, if you are new to engine builds or have a limited budget, a standard intake manifold may be a more suitable choice.

If you are considering purchasing the Speedmaster 1-148-002 for your performance project, ensure you have the necessary expertise, resources, and budget to install and maintain it. Verify the intake manifold's compatibility with your engine and vehicle before making the purchase. If you are confident in your abilities and have the resources, the Speedmaster 1-148-002 could be an excellent addition to your performance build.

Details:

Speedmaster throttle bodies have the following feature: - CNC machined, Heat treated 601 Cast aluminum. It also features a single screw adjustment for calibrating front to rear throttle shafts. O-ring seals on lower mounting faces. Fuel and air is delivered through precision cast aluminum 50mm IDA throttle bodies that allow for superior idle characteristics astounding response while improving emissions economy tight air/fuel ratio control.

EFI Sensor Kit Recommendation: PCE651.1016, O-O distance is measured from the of top and bottom O-rings. Butterflies are secured to center less ground brass shafts with split screws ensure reliability and serviceability. Specs Brand: Speedmaster Part Number: 1-148-002 Type: Intake Manifold, Fuel Injected Product Line: Individual Throttle Body / 8-Stack Engine Block Style: LS3 Injection 8 body Basic Operating RPM Range: Idle-7,000 Trumpets: Trumpets Included EGR: No Injectors Included: Rails Yes Pieces Base Material: Aluminum Casting Finish: Polished Assembled: Comes Non-Assembled Quantity: Sold as a Kit Notes: EFI Sensor Recommendation: PCE651.1016, The throttle system have all the flash of classic Weber induction but provide higher state tune and engine performance versatility. Delivering crisp EFI performance with systems capable of supporting high hp.

The bell crank has a fully index able eccentric cable pulley that enables good slow speed provability and still attain full throttle geometry. Speedmaster linkage set incorporates the throttle stops, idle controls, lever arms and joiner/balance all in one. Butterflies are measured for each bore precision machined to a closer tolerance.

part #: 1148002 prices

• $2249.00-$2578.95

specifications inputmanifolds:

• for models: Ls3, Efi
• for makes: Chevy
• brand: Speedmaster
• mounting style: Bolt-on
• type: Intake Manifold
• manufacturer warranty: 1 Year
• color: Silver
• manufacturer part number: 1-148-002
• features: Polished
• material: Aluminum
• fuel type: Gasoline

offer inputmanifolds:

• started: November 8, 2025
• options: Ship-to-home
• sold: 0
• availability: In Stock
• quantity: 3

general inputmanifolds:

• condition: New
• Car Truck Parts Accessories > Air Fuel Delivery > Intake Manifolds

returns inputmanifolds:

• policy: Returns Accepted
• time: 30 Days
• paid by: Seller

shipping inputmanifolds:

• cost: $0.00
• class: Standard
• type: Fixed
• transit: 6-12 Days
• service: FedEx Ground / FedEx Home Delivery
• carrier: FedEx

payments inputmanifolds:

• credit card: Mastercard
• other
• wallet: Google-pay

seller inputmanifolds:

• rating: 99.2%
• city: Rialto, California
• # reviews: 1558

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