1. Steering Wheels & Horn Buttons On Sale
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  3. GM 19300083

GM 19300083 Copo Mechanical Throttle Body 327CI 2.9SC 109MM

19300083 Gm Genuine Copo 327ci 2.9sc Mechanical Throttle Body Assembly 109mm

( Brand: Gm ), ( Manufacturer Part Number: 19300083 ), ( Part Type: Throttle ), ( Manufacturer Warranty: 1 Year ), ( Fitment Type: Direct Replacement ), ( Genuine Oem: Yes )

Review GM Genuine Copo 327ci Mechanical Throttle Body Assembly 109mm

The **GM 19300083 COPO 327ci 2.9L Small Block (2.9L SC) Mechanical Throttle Body (109mm)** is a meticulously crafted, high-performance component designed exclusively for the legendary Chevrolet COPO 327ci engines, particularly those featuring the 2.9L small-block architecture. This throttle body is engineered to deliver precise airflow control while maintaining the raw, mechanical responsiveness that enthusiasts crave in their high-performance applications. Built with a robust 109mm bore diameter, it ensures optimal throttle response and smooth operation under heavy loads, making it an ideal choice for both street and strip applications. The mechanical design eliminates the need for electronic sensors, offering a simpler, more reliable alternative for those seeking a no-frills, high-performance solution. This throttle body is compatible with a wide range of aftermarket fuel injection systems, including Holley, Edelbrock, and other high-flow setups, ensuring seamless integration with modern fuel delivery solutions. Crafted from durable materials, it is designed to withstand the demands of aggressive driving, high horsepower applications, and prolonged use, making it a long-lasting investment for serious performance enthusiasts. Whether you're restoring a classic COPO 327 or building a high-revving, high-horsepower engine, this throttle body provides the perfect blend of simplicity, performance, and reliability. Its compact yet robust construction ensures minimal air restriction while maximizing throttle response, allowing for effortless transitions between idle and wide-open throttle. Perfect for those who appreciate the raw, mechanical feel of a classic throttle body without sacrificing modern performance, this component is a must-have for any COPO 327ci build or restoration project.

### **Pros and Cons of Buying a 19300083 GM COPO 327ci 2.9L Turbocharged (2.9SC) with Mechanical Throttle Body (MTB) and 109mm Intake Manifold**

#### **Pros**

1. **Performance Potential**

- The **327ci V8** is a proven, high-revving engine with strong aftermarket support. With the right modifications, it can produce **500 HP** and **500 LB-FT** of torque, making it a favorite for street and drag applications.

- The **2.9L turbocharged setup** (2.9SC) was originally designed for **high-performance applications** (e.g., Trans Am, Firebird) and can still deliver strong power with proper maintenance.

- The **mechanical throttle body (MTB)** is simpler than electronic throttle control (ETC), making it easier to modify and tune for better throttle response.

2. **Classic Muscle Car Aesthetics & Driving Experience**

- The **COPO 327** (especially in a **Trans Am or Firebird**) is an iconic muscle car with a **sporty, aggressive stance** and a **V8 growl** that appeals to enthusiasts.

- The **manual transmission option** (if available) provides a more engaging driving experience compared to modern automatics.

- The **109mm intake manifold** is a **high-performance part** that allows for better airflow, improving throttle response and power delivery.

3. **Aftermarket & Modification Flexibility**

- The **327ci** benefits from **decades of tuning support**, including **ECU upgrades, fuel system modifications, and forced induction upgrades** (turbo, supercharger, or nitrous).

- The **MTB setup** is easier to modify than modern ETC systems, allowing for **custom wiring, pedal swaps, or even manual override systems**.

- The **turbocharged 2.9L** can be **rebuilt or upgraded** with modern turbochargers (e.g., Garrett, BorgWarner) for even more power.

4. **Potential for Restoration & Customization**

- If the car is **underserved or needs restoration**, it can be a **great project** for someone with mechanical skills.

- The **1970s COPO 327** is a **collector s item**, and well-maintained examples can appreciate in value over time.

- The **MTB and 109mm manifold** suggest that the owner (or previous owner) had **performance in mind**, which could mean **hidden potential** for further modifications.

5. **Lower Running Costs (Compared to Modern Muscle Cars)**

- **Fuel efficiency is decent for a V8** (though not great expect **12-15 MPG**).

- **Basic maintenance (oil changes, spark plugs, filters)** is relatively affordable.

- **Parts are widely available**, especially for the **327ci and 2.9L turbo** (though some OEM parts may be rare).

---

#### **Cons**

1. **High Maintenance & Reliability Concerns**

- **Turbocharged engines (2.9SC) are more complex** than naturally aspirated V8s, requiring **regular turbo inspections, oil changes, and cooling system maintenance**.

- **Worn-out internals** (rod bearings, pistons, valves) are common in high-mileage examples, leading to **expensive rebuilds**.

- **Fuel system issues** (injectors, pumps, fuel pressure regulators) can be problematic, especially if the car hasn t been properly maintained.

- **Transmission (if automatic)** may need **fluid changes and possible rebuilds** manuals are more reliable but require skill to drive.

2. **Cost of Restoration & Modifications**

- **Full restoration** (bodywork, interior, mechanicals) can be **extremely expensive**, especially if parts are rare.

- **Modernizing the engine** (e.g., **swapping in a modern 327ci crate engine**) may be cheaper than rebuilding the existing one.

- **Turbo upgrades** (if the original turbo is failing) can cost **$1,000 ** for a quality unit and installation.

- **Electronic upgrades** (ECU, sensors, wiring) may be necessary for **reliability and performance tuning**, adding to costs.

3. **Driving & Practicality Limitations**

- **Poor fuel economy** (expect **12-15 MPG** in daily driving).

- **High revving V8** can be **loud and vibration-prone** if not properly balanced.

- **Manual transmission** (if present) requires **skill to drive smoothly**, while automatics can be **jerky or unreliable**.

- **Modern safety and comfort features** (ABS, modern suspension, air conditioning) are **not standard**, requiring aftermarket upgrades.

4. **Market & Value Considerations**

- **Not a daily driver for most people** these cars are **better suited for weekends or track use**.

- **Insurance costs** will be **high** due to the **high-performance nature** and **potential for damage**.

- **Depreciation risk** while some COPO 327s appreciate, others (especially poorly maintained ones) **lose value quickly**.

- **Finding qualified mechanics** who specialize in **70s GM muscle cars** can be **difficult and expensive**.

5. **Potential Hidden Issues**

- **Turbocharged engines** often suffer from **oil leaks, wastegate failures, or turbo spool issues**.

- **Fuel-injected 2.9SC engines** may have **failing injectors, bad sensors, or vacuum leaks**.

- **Transmission (if automatic)** may need **fluid changes and possible rebuilds**.

- **Electrical gremlins** (from the **MTB and older wiring**) can be **frustrating to diagnose**.

---

### **Ending Conclusion**

Buying a **19300083 GM COPO 327ci 2.9L Turbocharged (2.9SC) with a mechanical throttle body and 109mm intake manifold** is a **high-reward, high-risk proposition**. It offers **exceptional performance potential, classic muscle car appeal, and modification flexibility**, but it also comes with **significant maintenance challenges, cost concerns, and practicality limitations**.

This car is **best suited for:**

- **Enthusiasts who enjoy restoration projects** and have the **time, money, and mechanical skills** to keep it running.

- **Track or weekend drivers** who prioritize **performance and fun** over daily convenience.

- **Owners who want a unique, high-performance muscle car** with **aftermarket support** and **modification potential**.

However, it is **not ideal for:**

- **Beginners or those without mechanical experience** (maintenance will be **time-consuming and expensive**).

- **Daily drivers** who need **fuel efficiency, reliability, and modern comforts**.

- **Budget-conscious buyers** expect **high upfront costs** and **ongoing expenses** for maintenance and upgrades.

---

### **Recommendation**

**If you are serious about this purchase, follow these steps:**

1. **Get a Full Pre-Purchase Inspection (PPI) by a trusted GM muscle car specialist.**

- Focus on **engine compression, turbo condition, fuel system, transmission, and electricals**.

- Check for **oil leaks, vacuum leaks, and exhaust restrictions**.

2. **Budget for a Full Restoration or Rebuild**

- If the engine is **high-mileage or worn**, factor in **$5,000 $15,000 ** for a **proper rebuild** (or consider a **crate engine swap** if the existing one is beyond repair).

- **Turbo upgrades** (if needed) can add **$1,000 $3,000 **.

- **Transmission work** (if automatic) may require **$1,500 $3,000** for a rebuild.

3. **Consider a Crate Engine or Swap**

- If the current engine is **unreliable**, a **new 327ci crate engine** (from **LS1, LS7, or even a modern 350 swap**) could be a **more cost-effective solution** in the long run.

4. **Prioritize Performance Modifications Over Cosmetics**

- **Fuel system upgrades** (injectors, pump, fuel rails) are **critical** for reliability.

- **Turbo upgrades** (if keeping the turbo setup) should be **high-quality** (e.g., **Garrett T3/T4, BorgWarner EFR**).

- **ECU tuning** (e.g., **Haltech, Link, or custom map**) will maximize power and reliability.

5. **Prepare for High Insurance & Maintenance Costs**

- **Insurance will be expensive** shop around for **specialty muscle car policies**.

- **Oil changes, spark plugs, and filters** should be done **every 3,000 5,000 miles** to prevent turbo and engine damage.

6. **Join Enthusiast Communities for Support**

- **COPO 327 forums (e.g

Details:

Parts must be resalable and in the original packaging. Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer. Genuine GM Copo 327ci 2.9SC Mechanical Throttle Body Assembly 109mm 19300083:: - COPO 327/2.9L S/Mechanical throttle body used on racing engines, engraved top of housing. Electrical parts are not returnable.

part #: 19300083 price

  • $1504.46

specifications steeringwheelsiiz:

  • brand: Gm
  • mpn: 19300083
  • part type: Throttle
  • manufacturer warranty: 1 Year
  • fitment type: Direct Replacement
  • genuine oem: Yes

payments steeringwheelsiiz:

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

shipping steeringwheelsiiz:

  • type: Fixed
  • cost: $50.00
  • service: Standard
  • class: Standard
  • transit: 3-8 Days

general steeringwheelsiiz:

  • condition: New
  • Car Truck Parts Accessories > Interior Parts Accessories > Steering Wheels Horn Buttons

seller steeringwheelsiiz:

  • city: Highland, Michigan
  • # reviews: 1854
  • rating: 99.6%

offer steeringwheelsiiz:

  • quantity: 4
  • started: June 1, 2026
  • sold: 0
  • options: Ship-to-home
  • availability: In Stock

returns steeringwheelsiiz:

  • time: 30 Days
  • paid by: Seller
  • policy: Returns Accepted
part type: throttle, manufacturer warranty: 1 year, fitment type: direct replacement, genuine oem: yes,
category: auto parts > car truck parts accessories > interior parts accessories > steering wheels horn buttons, sku: 30989415140610893,
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1 offer $1504.46 USD
  • New. Offer #1 priced at $1504.46 + $50.00 shipping estimate = $1554.46* total. Throttle Body - COPO 327/2.9L S/C.+$50.00 shipping

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