GM 12489371 Gmpp Ramjet Multiport Fuel Injection Vortec

( Brand: Gm ), ( Mounting Style: Bolt-on ), ( Color: Silver ), ( Manufacturer Part Number: 12489371 ), ( Cylinder Head Type: Vortec ), ( Material: Aluminum ), ( Vintage Part: Yes ), ( Placement On Vehicle: Front ), ( Fuel Type: Gasoline ), ( Type: Intake Manifold ), ( Engine Size: 350 In ), ( Features: Bare ), ( Country Of Origin: United States )

Review GM Chevy Gmpp Ramjet Multiport Fuel Injection System Vortec E tec fits 350

The GM 12489371 Chevy 350 GMPP Ramjet Multiport Fuel Injection system is an advanced fuel delivery solution designed specifically for the Vortec E-TEC engines found in select Chevrolet vehicles. This state-of-the-art fuel injection system takes engine performance to new heights by providing precise fuel delivery and efficient combustion.

The Ramjet Multiport Fuel Injection system is a direct replacement for traditional carbureted or throttle body injection setups. It utilizes a high-pressure fuel system to deliver fuel directly to the intake ports, allowing for a more complete and efficient combustion process. The multi-port design ensures that each cylinder receives an optimal fuel mixture, leading to improved engine power and torque.

The fuel delivery system is controlled by a sophisticated Electronic Control Module (ECM), which monitors engine parameters in real-time and adjusts fuel delivery accordingly. This closed-loop system ensures that the engine operates at optimal efficiency under various driving conditions, providing superior drivability and fuel economy.

The Ramjet Multiport Fuel Injection system features a number of advanced technologies to improve engine performance and reduce emissions. These include on-board diagnostics, which allow for easy troubleshooting and fault detection, and closed-loop emissions control, which helps the engine meet strict emissions standards.

The system includes all necessary components for a complete installation, including the fuel injection system, wiring harness, throttle body, and fuel pressure regulator. Installation is relatively straightforward, but it is recommended that the installation be performed by a certified technician to ensure proper calibration and optimal performance.

In summary, the GM 12489371 Chevy 350 GMPP Ramjet Multiport Fuel Injection system is a high-performance, efficient, and emissions-reducing fuel delivery solution for the Vortec E-TEC engines found in select Chevrolet vehicles. With precise fuel delivery, real-time engine monitoring, and advanced technologies, this system provides superior engine performance and improved drivability.

The GM 12489371 Chevy 350 Vortec engine, which comes with the Ramjet Multiport Fuel Injection (MPFI) system, is a popular choice for those seeking improved fuel efficiency and increased power in their Chevrolet vehicles. Here are some pros and cons associated with this engine:

1. Improved Fuel Economy: The Ramjet MPFI system is designed to optimize fuel delivery, resulting in improved fuel economy compared to traditional carbureted engines.

2. Enhanced Power: The fuel injection system enables the engine to deliver more power and torque throughout the RPM range, leading to better acceleration and overall performance.

3. Smoother Idle: The fuel injection system provides more consistent fuel delivery, resulting in a smoother idle and reduced engine vibration.

4. Better Emissions Control: The fuel injection system allows for more precise fuel delivery, which can help improve emissions control and reduce exhaust emissions.

5. Flexibility: The Vortec E-TEC engine can be used in various applications, including boats, RVs, and industrial equipment, making it a versatile choice.

1. Cost: The Ramjet MPFI system is more expensive than traditional carburetors, which can increase the overall cost of the engine and installation.

2. Complexity: The fuel injection system is more complex than a carburetor, which can result in additional maintenance requirements and potential issues.

3. Diagnostic Challenges: The fuel injection system may require specialized diagnostic tools and expertise to troubleshoot and repair any issues that arise.

4. Cold Weather Performance: The fuel injection system may struggle to perform effectively in cold weather conditions, which can impact starting and idling performance.

In conclusion, the GM 12489371 Chevy 350 Vortec engine with Ramjet MPFI system offers several advantages, including improved fuel economy, enhanced power, smoother idle, better emissions control, and flexibility. However, it also comes with some drawbacks, such as increased cost, complexity, diagnostic challenges, and cold weather performance.

Based on the information provided, it ultimately depends on the individual's priorities and requirements when considering whether to purchase this engine. If fuel efficiency, power, and flexibility are top priorities, then the advantages of the Ramjet MPFI system may outweigh the potential drawbacks. However, if cost, complexity, and cold weather performance are major concerns, then a traditional carbureted engine may be a better choice. Ultimately, it's essential to weigh the pros and cons carefully and consult with experts to make an informed decision.

Details:

MAP, TPS, CTS, IAC, PCV, FPR all on board intake. Bolts to Vortec and E-TEC 8 bolt intake pattern Uses LS1 electrical connectors. GM injectors 24# 43 psi. Complete EFI intake for small block Chevy.

This was on a running engine last year.

part #: 12489371 prices

• $384.99-$845.00

specifications inputmanifolds:

• for makes: Chevy
• brand: Gm
• mounting style: Bolt-on
• color: Silver
• manufacturer part number: 12489371
• cylinder head type: Vortec
• material: Aluminum
• vintage part: Yes
• placement on vehicle: Front
• fuel type: Gasoline
• type: Intake Manifold
• engine size: 350 In
• features: Bare
• country of origin: United States

offer inputmanifolds:

• options: Ship-to-home
• best offers: True
• sold: 0
• availability: In Stock
• quantity: 1
• started: November 7, 2025

seller inputmanifolds:

• city: Clinton Township, Michigan
• # reviews: 1529
• rating: 100.0%

payments inputmanifolds:

• wallet: Paypal
• other
• credit card: Diners-club

shipping inputmanifolds:

• class: Standard
• service: UPS Ground
• cost: $100.00
• transit: 3-7 Days
• carrier: UPS
• type: Fixed

general inputmanifolds:

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

returns inputmanifolds:

• policy: No Returns

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