GMC 306.CVHC07 Cylinder Head Hche C5500 6.6TD Head. 704-1

( Model: HCHE-CONV ), ( Part Type: Cylinder Head ), ( Conditions Options: T2 ), ( Genuine Oem: Yes ), ( Ipn: 306.cvhc07 )

Review GMC Cylinder Head. fits 2007

The **GMC 306.CVHC07 (2007 C5500 6.6L Duramax Diesel Cylinder Head Part #704-1)** is a precision-engineered component designed specifically for the iconic 2007 Chevrolet/GMC C5500 pickup truck, featuring the robust **6.6L Duramax L56 diesel engine**. This cylinder head is a critical element of the engine s performance, durability, and efficiency, crafted from high-grade cast iron to withstand the extreme pressures and temperatures generated by the turbocharged diesel combustion process. The head incorporates a **multi-valve design**, including **four valves per cylinder** (two intake and two exhaust), which optimizes airflow for improved combustion, reduced emissions, and enhanced power delivery. The **intake valves** are typically made from sodium-filled stainless steel to resist heat distortion, while the **exhaust valves** are often coated with a heat-resistant material to prolong lifespan and maintain sealing integrity under high thermal loads. This cylinder head is equipped with **hydraulic valve lifters**, eliminating the need for manual adjustment and ensuring smooth, consistent valve operation throughout the engine s service life. The **camshaft lobes** are precision-machined to synchronize valve timing, contributing to the engine s **torque-rich performance** a hallmark of the Duramax L56 while minimizing friction and wear. Additionally, the head features **integrated fuel injectors** (depending on the application) and **high-pressure fuel rail connections**, ensuring precise fuel delivery for optimal combustion efficiency. For emissions compliance, it may include **EGR (Exhaust Gas Recirculation) ports** and **turbocharger wastegate linkages**, allowing the engine to meet stringent **EPA and CARB regulations** while maintaining its reputation for reliability. Whether used in a **heavy-duty towing application, off-road adventure, or daily driving scenario**, this cylinder head is built to endure the demands of diesel power, offering a seamless fit for the **2007 C5500** with the **6.6L Duramax engine**. Proper installation, including the use of **high-quality gaskets, torque specifications, and proper sealing compounds**, is essential to prevent leaks and ensure long-term performance. For owners seeking to restore or upgrade their Duramax-powered C5500, this cylinder head represents a **direct OEM replacement**, guaranteeing compatibility and performance identical to the factory specification.

### **Pros and Cons of Buying a 2007 GMC C5500 with a 6.6L Duramax Diesel (704-1 Cylinder Head)**

#### **Pros**

1. **Durability and Longevity**

The 6.6L Duramax diesel engine is renowned for its robustness and ability to last well beyond 300,000 miles with proper maintenance. Many owners report engines running strong past 500,000 miles, especially if the turbo, injectors, and fuel system are well-maintained.

2. **High Torque and Towing Capacity**

The 6.6L Duramax produces **480 500 lb-ft of torque**, making it ideal for heavy-duty towing (up to **14,000 18,000 lbs** with proper equipment). This truck is well-suited for work applications, including hauling trailers, equipment, or large loads.

3. **Fuel Efficiency**

Diesel engines are more fuel-efficient than gasoline counterparts, especially on highway driving. The 2007 Duramax gets around **12 15 MPG** in mixed driving, which is better than most gasoline trucks of the era.

4. **Strong Resale Value**

Duramax trucks hold their value well compared to gasoline-powered trucks, particularly in the used market. A well-maintained 2007 C5500 with a 6.6L diesel can still fetch a decent price even after years of use.

5. **Low-Cost Fuel**

Diesel fuel is often cheaper per gallon than gasoline, reducing long-term operating costs. While prices fluctuate, diesel has historically been more economical for high-mileage drivers.

6. **Reliable Transmission (6-speed automatic)**

The 6-speed automatic transmission paired with the Duramax is smooth and durable, provided it has been properly serviced. Many owners report few issues if the transmission fluid has been changed regularly.

7. **Heavy-Duty Suspension and Frame**

The C5500 is built on a **heavy-duty frame** with reinforced components, making it suitable for off-road use, rough terrain, and heavy loads. The suspension is designed to handle significant weight.

8. **Aftermarket Support**

The Duramax has a strong aftermarket community, with availability of parts, upgrades (turbochargers, injectors, fuel systems), and performance modifications. This makes maintenance and upgrades more accessible.

9. **Low Operating Costs (Compared to Gas Engines)**

Diesel engines have fewer moving parts than gasoline engines, leading to lower maintenance costs over time. The Duramax s simplicity (no spark plugs, fewer sensors) reduces long-term repair expenses.

10. **Good for Commercial/Work Use**

If you use the truck for business (construction, farming, hauling), the Duramax s reliability and power make it a cost-effective choice compared to buying a new truck.

---

#### **Cons**

1. **High Initial Cost**

A 2007 Duramax truck, especially one in good condition, can be expensive upfront. Prices for well-maintained examples often range **$20,000 $40,000 **, depending on mileage and condition.

2. **Common Failure Points (If Neglected)**

- **Turbocharger Failure:** Early Duramax models (including the 704-1 head) are prone to turbocharger issues if not maintained. Worn turbos can cause **exhaust leaks, reduced power, and oil contamination**.

- **Injector Problems:** Fuel injectors can fail, leading to **rough idling, misfires, or complete engine failure** if not replaced. The 704-1 head is known for injector wear over time.

- **EGR and DPF Issues (Less Common in 2007):** While the 2007 Duramax predates DPF (Diesel Particulate Filter) requirements, some emissions-related components (like EGR coolers) can fail and cause overheating or power loss.

- **Water Pump and Thermostat Failures:** The 6.6L Duramax is notorious for **water pump and thermostat failures**, leading to overheating. Replacement is expensive ( $1,500 $2,500).

- **Fuel System Contamination:** Old fuel, water in the tank, or failed fuel filters can clog injectors and cause starting issues.

3. **Rust and Body Condition**

Many older GMC trucks suffer from **rust**, particularly in the frame, wheel wells, and undercarriage. A thorough inspection is crucial to avoid hidden repair costs.

4. **Transmission Issues (If Fluid Not Changed)**

The 6-speed automatic can develop **slippage, rough shifting, or failure** if the transmission fluid hasn t been changed regularly (every **60,000 100,000 miles**). Fluid changes are essential for longevity.

5. **Cold Weather Startup Difficulties**

Diesel engines, especially older ones, can struggle in **very cold temperatures** due to fuel gelling or starter motor limitations. A **block heater** may be necessary in freezing climates.

6. **Noise and Vibration**

The Duramax is a **loud truck**, especially at highway speeds. Some owners find the exhaust and turbo noise intrusive. Vibration can also be noticeable at certain RPMs.

7. **Limited Modern Tech**

The 2007 C5500 lacks modern safety features like **backup cameras, lane-keeping assist, or advanced driver aids**. If you prioritize tech, a newer truck may be more appealing.

8. **Emissions Compliance (Future Regulations)**

While the 2007 Duramax predates stricter emissions laws, future regulations could impact resale value or require modifications (e.g., DPF removal, which voids warranties and can cause long-term damage).

9. **Parts and Labor Costs**

While Duramax parts are available, some **specialty components (turbo, injectors, sensors)** can be expensive. Labor costs for repairs (especially on older models) can add up quickly.

10. **Diesel Exhaust Fluid (DEF) Not Required (But Future-Proofing May Be Needed)**

The 2007 Duramax does not require DEF, but newer models do. If you plan to keep the truck long-term, you may need to consider **retrofitting or upgrading** to avoid emissions-related issues.

---

### **Key Considerations Before Buying**

1. **Service History is Critical**

- **Turbo and injector service records** (have they been replaced?)

- **Transmission fluid changes** (every 60K 100K miles)

- **Water pump and thermostat replacements** (have they been done?)

- **Fuel system cleaning** (to prevent injector clogging)

2. **Pre-Purchase Inspection (PPI) is a Must**

- Turbocharger condition (listen for whine, check for leaks)

- Injector performance (scan for codes, test for proper spray pattern)

- Cooling system (radiator, hoses, water pump)

- Transmission fluid condition

- Exhaust system for leaks (especially around the turbo)

3. **Budget for Potential Repairs**

- **Turbo replacement:** $1,500 $3,000

- **Injector replacement (6-pack):** $1,500 $2,500

- **Water pump thermostat:** $1,500 $2,500

- **Transmission fluid change:** $300 $600

- **Rust repairs:** $500 $3,000 depending on severity

4. **Fuel Type Considerations**

- **Biodiesel compatibility:** The 2007 Duramax can run on **B20 (20% biodiesel)**, but pure biodiesel (B100) may cause issues with seals and rubber components.

- **Winter fuel additives:** In cold climates, consider **diesel fuel conditioners** to prevent gelling.

5. **Alternative Uses**

- If you **don t tow heavily**, a **gas-powered truck** (e.g., 2010 Ford F-250, Chevy Silverado 2500HD) may be more practical with lower maintenance costs.

- If you **need a daily driver**, a newer diesel (2017 Duramax) or a **gas truck with better tech** might be more comfortable.

---

### **Final Recommendation**

You **need a heavy-duty work truck** for towing, hauling, or commercial use.

You **find one with a complete service history**, especially for turbos, injectors, and cooling system components.

You **budget for potential repairs** (turbo, injectors, water pump) and are prepared for higher upfront costs.

You **don t mind noise, vibration, and lack of modern tech** in exchange for reliability and power.

Details:

Labor and costs associated with part installation are not covered under warranty. 704-1 7884470 2007 GMC 6.6TD Cylinder Head. 2007 GMC C5500 6.6TD Cylinder Head.

part #: hche prices

• $106.34-$184.68

specifications cylinderheapar:

• for makes: Gmc
• for years: 2007
• model: Hche-conv
• part type: Cylinder Head
• conditions options: T2
• genuine oem: Yes
• ipn: 306.cvhc07

payments cylinderheapar:

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

general cylinderheapar:

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

offer cylinderheapar:

• availability: In Stock
• quantity: 1
• sold: 0
• started: May 7, 2026
• best offers: True
• options: Ship-to-home

shipping cylinderheapar:

• class: Freight
• service: Flat Rate Freight
• cost: $0.00
• type: Fixed

returns cylinderheapar:

• time: 60 Days
• paid by: Buyer
• policy: Returns Accepted

seller cylinderheapar:

• # reviews: 50322
• rating: 99.9%
• city: Spokane, Washington

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