MERCEDES 2780107420 Right Cylinder Head Benz 4.6L

( Manufacturer Part Number: 2780107420 ), ( Part Type: Cylinder Head ), ( Item Weight: 26.46 ), ( Tag : 37767 ), ( Item Warranty: 6 Months )

Review MERCEDES benz 4.6l Right Side Cylinder Head Oem fits W218 CLS550 RWD 2011–2020

The **Mercedes-Benz 2780107420 (2011 2020 W218 CLS 550 RWD 4.6L Right Cylinder Head)** is a high-performance, precision-engineered component designed exclusively for the iconic **CLS-Class (W218) 5.5-liter V8 models** produced between 2011 and 2020. This right-hand cylinder head is a critical part of the **M278 E55** engine, a legendary powerplant renowned for its robust construction, smooth operation, and impressive output of **388 429 horsepower** depending on the model variant. Crafted from high-grade **cast aluminum** with advanced **cylinder head gasket technology**, this component ensures optimal sealing, thermal efficiency, and durability under high-performance driving conditions. The design incorporates **four intake and four exhaust valves per cylinder**, operated by a **double overhead camshaft (DOHC) system**, allowing for precise airflow management and enhanced combustion efficiency. The **right cylinder head** is specifically engineered to pair seamlessly with the **M278 engine s left counterpart**, forming a balanced and harmonious power assembly. Featuring **integrated valve springs, retainers, and hydraulic lash adjusters**, this head minimizes wear while maintaining consistent valve timing, even under aggressive driving scenarios. Additionally, the **intake manifold ports** are optimized for smooth airflow, contributing to the engine s signature **torque-rich delivery and refined V8 growl**. Whether restoring a classic CLS 550 or upgrading an existing engine, this **OEM-quality cylinder head** ensures reliability, performance, and the unmistakable Mercedes-Benz driving experience. Built to exacting standards, it is a must-have replacement for enthusiasts seeking to preserve or enhance the legendary character of the W218 s 4.6-liter V8.

### **Pros and Cons of Buying a Mercedes-Benz W218 CLS 550 (RWD, 4.6L V8, 2011 2020) with a Right Cylinder Head Issue (Part Number 2780107420)**

#### **Pros**

1. **Strong Engine and Performance**

- The 4.6L V8 (M276) is a robust, naturally aspirated engine known for reliability when properly maintained. It produces **388 400 hp** and **420 lb-ft of torque**, delivering strong acceleration and a smooth power delivery.

- The RWD configuration provides a more engaging driving experience compared to AWD models, with better handling and a sportier feel.

2. **Luxury and Comfort**

- The W218 CLS is a premium sedan with high-quality materials, refined cabin acoustics, and a spacious interior (especially in later years with updated trims).

- Features like **adaptive dampers, heated/ventilated seats, and advanced sound systems** enhance comfort for long drives.

3. **Resale Value and Brand Prestige**

- Mercedes-Benz retains strong resale value, and the CLS remains a desirable model among enthusiasts.

- The brand carries prestige, which can be appealing if you value luxury and status.

4. **Availability of Parts and Aftermarket Support**

- As a discontinued model, parts (including the cylinder head gasket kit **2780107420**) are still widely available from Mercedes dealerships, third-party suppliers, and aftermarket vendors.

- The V8 is a well-documented engine, with extensive tuning potential (e.g., forced induction upgrades, exhaust modifications).

5. **Potential for Modifications**

- The 4.6L V8 responds well to performance modifications, such as **intake/exhaust upgrades, ECU tuning, or even forced induction** (though supercharging requires careful engineering).

- The RWD layout makes it a good candidate for **suspension tuning (coilovers, sway bars) and brake upgrades** for improved handling.

6. **Lower Running Costs (Compared to Modern Luxury Cars)**

- Fuel economy is modest ( 14 16 MPG combined), but maintenance costs (oil changes, brake pads, etc.) are often lower than those of modern turbocharged luxury cars.

- The V8 is less prone to complex turbocharger or hybrid-related issues found in newer Mercedes models.

---

#### **Cons**

1. **Cylinder Head Gasket Issue (Part Number 2780107420)**

- The **most critical concern** is the **right cylinder head gasket failure**, which can lead to **coolant leaks, overheating, or engine damage** if ignored.

- Symptoms include **white smoke from the exhaust, coolant loss, overheating, or a hissing sound** near the head.

- **Repair cost**: Replacing the gasket (and often related components like water pump, thermostat, and head bolts) typically ranges from **$1,500 $3,000**, depending on labor rates and additional wear.

- **Risk**: If the engine has already suffered internal damage (e.g., warped head, burnt valves), repairs could exceed **$4,000 $6,000**.

2. **Aging Reliability Concerns**

- While the **4.6L V8 is durable**, it is **not as refined as modern turbocharged engines** and requires **regular maintenance** (timing belt, valve cover gaskets, oil changes every **5,000 7,500 miles**).

- **Water pump failure** (often linked to the head gasket issue).

- **Transmission problems** (especially in early models; later years improved with **7G-Tronic**).

- **Electrical gremlins** (infotainment glitches, sensor failures).

- **Suspension wear** (struts, bushings, and control arms degrade over time).

3. **Fuel Economy and Environmental Concerns**

- The **V8 s thirst ( 14 16 MPG)** makes it less practical for daily commuting compared to modern hybrids or turbocharged engines.

- **Emissions regulations** may affect future ownership if stricter laws are introduced (though unlikely for a discontinued model).

4. **Maintenance Costs Over Time**

- **High labor rates** at dealerships.

- **Specialized parts** (e.g., OEM cylinder head gaskets, timing components).

- **Potential for hidden damage** (e.g., warped head, burnt valves) if the gasket fails catastrophically.

5. **Depreciation and Market Demand**

- The W218 CLS is **not as sought-after as the AMG or newer models**, meaning resale value depreciates faster than some competitors.

- **Buyers may prefer turbocharged or hybrid alternatives**, reducing long-term appeal.

6. **Driving Experience Limitations**

- While the RWD setup is fun, the **heavy weight ( 4,000 lbs)** and **softer suspension tuning** make it less nimble than a sports sedan.

- **Turbo lag (if modified)** or **poor throttle response (stock)** can be noticeable compared to modern turbocharged engines.

---

### **Ending Conclusion**

Buying a **2011 2020 Mercedes-Benz W218 CLS 550 RWD (4.6L V8) with a right cylinder head gasket issue** is a **high-risk, high-reward** decision. The **pros** strong engine, luxury comfort, and modification potential are significant, but the **cons**, particularly the **gasket failure risk and repair costs**, cannot be ignored.

- **Verify the extent of the head gasket issue** (coolant leaks, overheating history, previous repairs).

- **Budget for a full cylinder head service** (including water pump, thermostat, and head bolts).

- **Ensure the engine is in otherwise good condition** (check for warped heads, burnt valves, or transmission issues).

- **Be prepared for higher long-term maintenance costs** compared to modern alternatives.

**If the car is already showing signs of gasket failure (smoke, overheating, coolant loss), the repair may not be worth it unless you are an experienced mechanic willing to take on the risk.**

---

### **Recommendation**

- **Buy the CLS 550 RWD** if the **cylinder head is confirmed sound** and the car has **low mileage (

- **Budget $2,000 $3,500 for a cylinder head service** if any issues are found.

- **Consider a pre-purchase inspection (PPI) by a Mercedes specialist** to avoid hidden problems.

- **Avoid this model** unless you are prepared for **potential major repairs**.

- **Mercedes C204 CLS (2021 ) with AMG trim** (more modern, turbocharged, better reliability).

- **BMW 5 Series (N54/N55) or Audi S6** (similar V8 power, better long-term reliability).

- **Used luxury sedans with hybrid/turbocharged engines** (e.g., Lexus GS, Genesis G80) for better fuel economy.

- The **4.6L V8 is a good donor engine** for other W218 models (E550, S550, etc.), but **ensure the block and head are structurally sound**.

The **W218 CLS 550 RWD is a fantastic car for the right buyer** someone who **values raw power, luxury, and modification potential** and is **willing to accept (or mitigate) the risks**. However, **if the cylinder head is compromised, the repair cost may outweigh the car s value**, making it a **high-risk purchase unless you are confident in the engine s condition**. For most buyers, **modern alternatives offer better reliability and lower long-term costs**.

Details:

Naturally, my gently used vehicle was missing the Owners Manual. Item arrived securely packaged, as described. It has normal wear of use because it is a used part. I've purchased several times from this vendor and I m sure I ll be purchasing again.

This reliable vendor provided a great price, with fast shipping. Unfortunately I ordered an item that already which the mistake was mine. Fast Reliable. So I sourced this older, complete Manual set for my make and model.

Quality Assurance. Decent pricing also. Item arrived earlier than the expected date. All parts are tested and inspected for reliability performance.

This item is used but in good working condition. Shipping was super fast, I received the item next day. The higher than average shipping cost was offset by a lower price. Packaging was exceptional.

Contact for fitment Purchase Price. The price was fair and competitive. How do people live, right. Warranty Accepted within 6 months of purchase.

Wide Range of Parts. Key Features: Tag Number 37767, Year/Year Range 2012, Make Mercedes-Benz, model CLS550, Sub model AMG, Series W218. The Manual should never leave the Glove Compartment so, ya know, its there for maybe new owners down road. All used items will show normal signs of use such as nicks, scuffs, and scratches.

Product in pristine condition as described, super fast shipping and great packaging, value communication. Genuine Second-hand Parts for Every Premium Brand 2011 2020 Mercedes W218 CLS550 RWD 4.6L Right Side Cylinder Head OEM. Pricing was a great value. Packaging was minimal, yet effective.

Part Number. Super fast shipping even with so oversized packages and good communication. Great purchase experience. Item is exactly what was described.

part #: 2780107420 prices

• $149.93-$700.00

specifications cylinderheapar:

• for models: W218, Cls550, Rwd
• for makes: Mercedes
• for years: 2011-2020
• mpn: 2780107420
• part type: Cylinder Head
• item weight: 26.46
• tag : 37767
• item warranty: 6 Months

general cylinderheapar:

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

seller cylinderheapar:

• rating: 99.5%
• # reviews: 57664
• city: West Sacramento, California

offer cylinderheapar:

• quantity: 1
• best offers: True
• options: Ship-to-home
• sold: 0
• availability: In Stock
• started: May 14, 2026

shipping cylinderheapar:

• carrier: FedEx
• cost: $80.00
• transit: 4-7 Days
• class: Economy
• type: Fixed
• service: FedEx Ground Economy

returns cylinderheapar:

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

payments cylinderheapar:

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

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