GM TRUCKS 8890603990 Cylinder Head 306-139 2.9L

( Brand: Gm Trucks ), ( Manufacturer Part Number: 8890603990 ), ( Material: Aluminum ), ( Vintage Part: No ), ( Interchange: 306-139 ), ( Type: Cylinder Head ), ( Manufacturer Warranty: 1 Month ), ( Id: 7808f0c9-aba6-4176-9c43-c7b50250e605 ), ( Country Of Origin: United States )

Review GM TRUCKS Chevy Colorado Cylinder Head 2.9l Oem fits CANYON I-290 2007–2008

The **GM 8890603990 cylinder head** is a precision-engineered component designed specifically for the **2007 2008 Chevrolet Canyon** and **GMC Canyon** models, built to power the **2.9L inline-6 (I-6) engine** (commonly referred to as the **L67** or **L68** engine family). This high-performance head is crafted from durable cast iron, ensuring long-lasting reliability under the demanding conditions of daily driving, towing, or off-road adventures. The design features a **single overhead camshaft (SOHC)** configuration with **three valves per cylinder (two intake and one exhaust)**, allowing for optimized airflow and improved combustion efficiency. The intake ports are generously sized to maximize air intake, while the exhaust ports are strategically shaped to enhance scavenging, reducing backpressure and boosting engine responsiveness. The head is equipped with **hydraulic valve lifters**, eliminating the need for frequent valve adjustments and ensuring smooth operation over thousands of miles. The **spark plug holes** are precisely drilled to accommodate standard 14mm plugs, and the **camshaft bearing caps** are securely held in place with high-strength bolts, preventing warping or misalignment under high RPM or heavy loads. This cylinder head is fully compatible with the **I-290** engine variant, which is known for its robust construction and suitability for both light-duty and moderate towing applications. Whether you're restoring a classic Canyon, upgrading an existing engine, or replacing a worn-out head, this GM part is built to meet or exceed factory specifications, ensuring peak performance, fuel efficiency, and longevity. Proper installation requires the use of **GM-approved gaskets, torque specifications, and sealing compounds** to prevent leaks and maintain optimal compression. For best results, follow GM s recommended service procedures, including proper bedding of the head gasket and correct valve lash adjustments if applicable. This head is a critical component for maintaining the integrity and efficiency of your 2.9L inline-six, making it an essential replacement for any serious mechanic or enthusiast seeking reliability and power.

### **Pros and Cons of Buying a 2007-2008 Chevrolet Canyon with a 2.9L I-290 Cylinder Head (GM Part # 8890603990)**

1. **Reliability of the 2.9L I-6 Engine** The 2.9L inline-six (I-290) is a well-known durable engine, especially in older GM trucks like the Canyon. It s known for its smooth power delivery and longevity when maintained properly. Many examples with high mileage still run strong with basic upkeep.

2. **Good Fuel Economy for a Truck** Compared to V8 engines, the 2.9L offers decent fuel efficiency (around 15-18 MPG combined), making it more economical to run than a gas-guzzling V8.

3. **Simpler Mechanical Design** The inline-six has fewer moving parts than a V8, which can mean lower repair costs and easier maintenance. It s also less prone to common V8 issues like rod knock or valve train problems.

4. **Potential for Modifications** The 2.9L is a popular engine for performance builds, especially in the aftermarket tuning community. Swapping in a turbocharger, upgrading the intake/exhaust, or adding a supercharger can significantly boost power while keeping the stock block intact.

5. **Used Parts Availability** Being a common GM engine, parts like belts, hoses, and basic components are widely available and affordable. The cylinder head (GM #8890603990) is a stock part, meaning it s easy to source if needed.

6. **Lower Running Costs Than a V8** Without the complexity of a V8, maintenance (oil changes, timing belt, etc.) tends to be cheaper. The 2.9L also doesn t require as frequent valve adjustments as some older inline-sixes.

7. **Potential for a Project Build** If you re mechanically inclined, this truck could be a fun project. Restoring it to running condition or modifying it for performance can be rewarding.

---

1. **Age and Mileage Concerns** A 2007-2008 Canyon with a 2.9L will likely have significant mileage (100K miles is common). Older engines can develop issues like:

- **Worn valve train** (lifters, camshaft wear)

- **Rod bearing or main bearing wear** (common in high-mileage inline-sixes)

- **Head gasket leaks** (though the stock head is a good sign, soft heads can develop cracks over time)

- **Timing belt/chain wear** (if not recently replaced, this could lead to catastrophic engine failure)

2. **Transmission Issues** Many early 2000s GM trucks (including the Canyon) came with the **4L60-E or 4L65-E automatic transmissions**, which are notorious for:

- **Slipping or rough shifting**

- **Torque converter failure**

- **Solenoid or valve body problems**

- **Fluid leaks and burning smells**

A rebuild or replacement may be needed if the transmission is neglected.

- **Rust in the frame rails** (critical for structural integrity)

- **Worn-out shocks, bushings, and ball joints**

- **Rusty control arms and sway bars**

A thorough inspection of the frame and suspension is essential before buying.

- **Failing power windows or locks**

- **Worn-out seats and upholstery**

- **Electrical gremlins** (common in older GM trucks)

- **AC and heater issues** (compressor failure, refrigerant leaks)

- **Warped or cracked heads** (common in high-mileage engines due to overheating or poor cooling)

- **Leaking valve cover gaskets**

- **Worn exhaust valves** (can lead to blow-by and oil consumption)

A compression test or leak-down test is recommended to check for internal engine issues.

6. **Resale Value and Market Demand** The Canyon is not a highly sought-after truck, especially in its current form. If you plan to sell later, you may not recoup much of your investment unless it s in excellent condition or heavily modified.

7. **Potential for Hidden Problems**

- **Fuel system issues** (clogged injectors, bad fuel pump)

- **Exhaust manifold leaks** (common in the 2.9L)

- **Water pump failure** (can lead to overheating)

- **Serpentine belt tensioner failure** (can cause belt slippage)

---

### **Conclusion and Recommendation**

- **Mechanically inclined buyers** who enjoy working on projects and restoring vehicles.

- **Those who prioritize reliability over luxury** and are okay with a truck that may need some TLC.

- **Budget-conscious buyers** who want a used truck with decent fuel economy and potential for modifications.

- **People who plan to keep the truck long-term** and are willing to invest in maintenance.

- **Buyers who want a "drive-and-go" truck** with minimal upkeep.

- **Those who dislike older GM transmissions** (4L60-E/4L65-E) and are unwilling to rebuild or replace it.

- **People in harsh climates** (salt, snow, or extreme heat) who haven t inspected the frame and undercarriage for rust.

- **Those who expect high resale value** this truck will depreciate quickly unless heavily modified.

If you **inspect the truck thoroughly** (engine compression test, transmission fluid check, frame inspection, suspension, and electrical systems) and are prepared for potential repairs, a **2007-2008 Chevrolet Canyon with a 2.9L I-290 engine can be a solid buy**. The stock cylinder head (GM #8890603990) is a good sign, but ensure the rest of the engine is sound.

1. **Get a pre-purchase inspection (PPI)** from a trusted mechanic.

- Engine compression (should be consistent across all cylinders).

- Transmission fluid condition and shift smoothness.

- Frame rust (especially around welds and wheel wells).

- Suspension components (shocks, bushings, ball joints).

- Electrical system (test all windows, locks, and gauges).

3. **Budget for potential repairs** (transmission rebuild, suspension refresh, minor engine work).

4. **Consider a lower-mileage example** (under 100K miles) if possible, as it will likely require fewer repairs.

- It can be a **great project truck** or a **reliable daily driver** with proper maintenance.

- The **2.9L engine is a strong platform** for modifications if you re interested in performance builds.

- It may not be worth the risk unless you re okay with a long-term project.

If you re open to other options, a **2009 Canyon with the 4.3L V6 or 5.3L V8** might offer better reliability and resale value, but they come with their own trade-offs (higher fuel consumption, different maintenance needs).

Details:

Picture in the listing may not be of actual item sold; it a stock picture only. Block, Cylinder Heads, Timing Cover, Oil Pan, Flywheel. Most items are shipped the same-day as purchase. Transmissions must be shipped to a commercial address with dock and forklift or the closest shipping terminal.

Depending on the age of vehicle and other circumstances they will rust show signs corrosion. In some cases the Transmission Control Computer module is internal and incorporated with valve body, which may require body to be replaced. Quick shipping. Axle seals, front and drive shaft seals will also need to be replaced.

Warranty period begins the day after delivery. Transmission lines will need flushed, along with the transmission oil cooler needs replaced if equipped, this to be done so contaminants from bad not ruin your replacement. Some external sensors or solenoids may need to be replaced. Transfer cases will not be included with transmissions from 4x4 or All Wheel Drive vehicles.

Free shipping, if offered, applies only to commercial addresses with proper equipment dock and forklift unload. Buyer will need to replace the transmission oil filter, put a new pan gasket on, flush and add manufacturer specific fluids. Buyer pays return shipping if wrong color ordered. Engines must be shipped to a commercial address with dock and forklift or the closest shipping terminal.

part #: 8890603990 prices

• $44.44-$152.95

specifications cylinderheapar:

• for models: I-290, Canyon
• for makes: Chevy
• for years: 2007-2008
• brand: Gm Trucks
• mpn: 8890603990
• material: Aluminum
• vintage part: No
• interchange: 306-139
• type: Cylinder Head
• manufacturer warranty: 1 Month
• id: 7808f0c9-aba6-4176-9c43-c7b50250e605
• country of origin: United States

seller cylinderheapar:

• rating: 99.6%
• city: Erie, Pennsylvania
• # reviews: 24573

general cylinderheapar:

• Car Truck Parts Accessories > Engines Engine Parts > Cylinder Heads
• condition: Used

offer cylinderheapar:

• quantity: 1
• availability: In Stock
• started: March 27, 2026
• options: Ship-to-home
• best offers: True
• sold: 0

shipping cylinderheapar:

• class: Standard
• cost: $0.00
• type: Fixed
• service: Standard
• transit: 3-6 Days

payments cylinderheapar:

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

returns cylinderheapar:

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

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