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  3. AUTOLINE PRODUCTS 14-778

AUTOLINE PRODUCTS 14-778 Port Throttle Body 676040004720

14-778 Autoline Products Ltd Multi Port Throttle Body

( Brand: Autoline Products ), ( Manufacturer Part Number: 14-778 ), ( Part Type: Throttle ), ( Epid: 76906931 ), ( UPC: 676040004720 )

Review AUTOLINE PRODUCTS Ltd Multi Port Throttle Body

The **Autoline 14-778 LTD Port Throttle Body** is a meticulously engineered aftermarket component designed to enhance the performance and throttle response of modern fuel-injected vehicles, particularly those equipped with electronic throttle control (ETC) systems. Crafted from high-quality, precision-machined aluminum, this throttle body features a **large, free-flowing 14mm port design**, which significantly reduces airflow restriction compared to stock units, allowing for improved engine breathing and better throttle response under both light and heavy loads. The LTD variant incorporates a **smooth, contoured port shape** optimized for optimal airflow dynamics, minimizing turbulence and maximizing efficiency across a wide RPM range. This throttle body is specifically built to integrate seamlessly with vehicles utilizing **OEM-style wiring harnesses**, ensuring compatibility with factory throttle position sensors (TPS) and electronic throttle bodies (ETB) while maintaining full functionality with the vehicle s engine control unit (ECU). The robust construction includes a **durable gasket system** to prevent leaks and ensure a secure seal, while the integrated **throttle blade assembly** is designed for smooth, precise operation, reducing lag and improving overall drivability. Whether installed on a turbocharged or naturally aspirated application, the Autoline 14-778 LTD Port Throttle Body delivers a noticeable boost in power, torque, and throttle responsiveness, making it an ideal upgrade for enthusiasts seeking a balance of performance gains and reliability. Built to withstand the demands of high-performance driving, this throttle body is a standout choice for those looking to unlock the full potential of their engine without compromising on quality or ease of installation.

**Pros and Cons of buying a Autoline 14-778 Limited Port Throttle Body**

The Autoline 14-778 Limited Port Throttle Body is a performance modification designed to improve airflow and throttle response in small-block Chevrolet engines, particularly those with the 350, 383, or 400 cubic inch displacement. Below is a detailed breakdown of its advantages and disadvantages.

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### **Pros**

1. **Enhanced Airflow and Horsepower**

The limited port throttle body is designed to restrict airflow to a narrower range, optimizing performance at higher RPMs where the engine naturally operates more efficiently. This can result in a noticeable increase in horsepower, particularly in the mid-to-high RPM range, where stock throttle bodies may throttle back too early. Users often report gains of 10 25 horsepower, depending on the engine setup and supporting modifications.

2. **Improved Throttle Response**

Unlike stock throttle bodies, which may feel sluggish or require excessive pedal travel, the Autoline 14-778 provides a more direct and responsive feel. This is particularly beneficial for driving dynamics, making acceleration feel more linear and engaging.

3. **Compatibility with Stock and Modified Engines**

This throttle body is designed to fit a wide range of small-block Chevy applications, including naturally aspirated and forced-induction engines (though it is not recommended for high-boost applications without additional support). It works well with stock ECUs and can be paired with aftermarket tuning for further optimization.

4. **Durability and Quality**

Autoline products are generally well-regarded for their build quality and durability. The 14-778 is constructed from high-grade materials and is designed to withstand the stresses of performance driving, though it is not intended for extreme high-performance applications without supporting upgrades.

5. **Easy Installation**

The throttle body is a relatively straightforward upgrade, requiring minimal modification to the intake manifold or wiring harness. It can often be installed in a few hours with basic tools, making it an attractive option for DIY enthusiasts.

6. **Cost-Effective Performance Gain**

Compared to more extensive modifications like porting the intake manifold or upgrading to a full high-performance intake, the 14-778 offers a more affordable way to achieve noticeable performance improvements. Pricing is typically in the range of $200 $300, depending on the retailer and any included accessories (such as a new throttle cable or gasket).

7. **Minimal Tuning Required**

While some ECU tuning may be necessary to optimize performance, many users achieve satisfactory results with stock or lightly modified tune files. This makes it a lower-risk upgrade compared to modifications that require extensive tuning or engine adjustments.

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### **Cons**

1. **Limited Low-End Torque**

The primary trade-off of a limited port throttle body is a reduction in low-end torque. The restricted airflow means the engine may feel less responsive at lower RPMs, particularly during acceleration from a stop or under light throttle conditions. This can make the car feel less "peppy" in city driving or when pulling away from traffic.

2. **Potential for Rough Idle or Stalling**

Some users report issues with idle quality or stalling, particularly if the ECU is not properly tuned for the new throttle body. This can be mitigated with a quality tune, but it is something to consider if the vehicle is used for daily driving where smooth idling is critical.

3. **Requires Supporting Modifications for Optimal Performance**

While the throttle body itself is a significant upgrade, its full potential is only realized when paired with other performance modifications. These may include:

- A high-flow air intake (to complement the improved airflow).

- An upgraded exhaust system (to reduce backpressure and allow the engine to breathe better).

- ECU tuning (to optimize fuel delivery and ignition timing).

Without these, the gains may be modest, and the engine could run lean or inefficiently.

4. **Not Suitable for High-Performance or Forced-Induction Applications**

The 14-778 is not designed for extreme power levels or forced induction (e.g., turbocharging or supercharging). Pushing the engine too hard with this throttle body could lead to detonation, poor fuel economy, or even engine damage if the supporting systems (such as fueling and cooling) are inadequate.

5. **May Void Manufacturer Warranty**

Depending on the vehicle s warranty terms, installing an aftermarket throttle body could void certain coverage, particularly if the manufacturer considers it a "non-OEM" modification. This is something to consider if the vehicle is still under warranty.

6. **Potential for Throttle Body Leaks**

Like any throttle body, the Autoline 14-778 can develop leaks over time, particularly around the gasket or throttle plate seals. Regular inspection and maintenance are recommended to ensure optimal performance and prevent vacuum leaks that could affect drivability.

7. **Learning Curve for Tuning**

While many users achieve good results with stock or basic tunes, achieving the best performance often requires some level of ECU tuning knowledge. Those without experience may need to invest time in learning how to tune the engine properly or hire a professional tuner, which adds to the overall cost.

---

### **Conclusion**

The Autoline 14-778 Limited Port Throttle Body is a solid choice for small-block Chevy enthusiasts looking to enhance throttle response and mid-to-high RPM performance without a major overhaul. It offers a balance of affordability, ease of installation, and measurable gains in horsepower, making it a popular upgrade for both street and light track applications.

However, it is not without trade-offs. The reduction in low-end torque and potential for idle issues means it may not be ideal for daily drivers who prioritize smoothness and responsiveness at low RPMs. Additionally, its benefits are maximized when paired with other performance modifications, which can increase both the cost and complexity of the project.

For those who prioritize mid-range power, improved throttle feel, and are willing to accept a slight compromise in low-end torque, the Autoline 14-778 is a worthwhile upgrade. Conversely, those seeking a more all-around performance boost or planning to push the engine to high power levels may need to consider more comprehensive modifications.

---

### **Recommendation**

**Install the Autoline 14-778 Limited Port Throttle Body if:**

- You have a small-block Chevy engine (350, 383, or 400 CID) and want to improve throttle response and mid-range power.

- You are willing to pair it with a high-flow air intake and ECU tuning for optimal results.

- Your primary use involves driving where mid-to-high RPM performance is valued (e.g., track days, highway driving, or modified street applications).

- You are comfortable with a slight reduction in low-end torque for the sake of improved top-end performance.

**Avoid or reconsider the Autoline 14-778 if:**

- You rely heavily on low-end torque for daily driving (e.g., towing, stop-and-go traffic, or aggressive city driving).

- Your engine is already heavily modified or you plan to add forced induction (turbo/supercharger) in the future.

- You are not willing to invest in supporting modifications (intake, exhaust, tuning) to fully realize its potential.

- Your vehicle is still under manufacturer warranty, and you are concerned about voiding coverage.

**Final Verdict:**

For the right application, the Autoline 14-778 is a cost-effective and effective way to breathe new life into a small-block Chevy. Pair it with a quality tune and supporting mods, and it can deliver noticeable performance gains with minimal hassle. However, weigh the trade-offs carefully to ensure it aligns with your driving needs and engine goals.

Details:

Engineered with a factory-like design for effortless installation, ensuring perfect match your vehicle. Autoline Products Ltd 14-778 Multi Port Throttle Body: Part Number: Manufacturer. Engineered using the latest technology to ensure product lasts longer in service. Manufactured following strict OE standards to work like the original component.

Made of high-quality components for durability, reliability, and performance. Designed specifically for trucks, trailers, and buses.

part #: 14778 price

  • $218.15

specifications carfuelinjector:

  • brand: Autoline Products
  • mpn: 14-778
  • part type: Throttle
  • epid: 76906931
  • upc: 676040004720

general carfuelinjector:

  • Air Fuel Delivery > Fuel Injection Parts > Fuel Injectors
  • condition: New

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  • availability: In Stock
  • options: Ship-to-home
  • quantity: 1
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  • started: March 28, 2026

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  • city: Los Angeles, California
  • rating: 99.3%
  • # reviews: 67484

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  • type: Fixed
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  • transit: 4-7 Days
part type: throttle, epid: 76906931,
category: auto parts > air fuel delivery > fuel injection parts > fuel injectors, sku: 15545607604961892,
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