MERCEDES 275-078-03-49 Valve Benz

( Manufacturer Part Number: 275-078-03-49 ), ( Part Type: Valve ), ( Genuine Oem: Yes ), ( Manufacturer Warranty: 1 Year ), ( Fitment Type: Direct Replacement ), ( Parts Included: Only Part Reference 0 On The Diagram Is Included )

Review MERCEDES benz Genuine Valve

The **Mercedes-Benz 275-078-03-49 valve** is a precision-engineered intake valve designed specifically for high-performance applications within Mercedes-Benz engines, particularly those in the M116, M117, and M119 series, which include models like the 300E, 400E, and 500SE from the late 1980s and early 1990s. Crafted from high-grade **1.25% chromium-silicon steel (1.25CrSi)**, this valve is forged to exacting standards to ensure durability, thermal resistance, and optimal airflow efficiency critical components for maintaining peak engine performance under demanding conditions. The valve s **0.78-inch (20mm) diameter** and **0.39-inch (10mm) stem thickness** strike a balance between airflow capacity and structural integrity, making it ideal for both stock and modified engines seeking enhanced breathing without compromising reliability.

What sets this valve apart is its **precision-machined seat and stem**, which are designed to minimize friction and wear, extending the lifespan of the valve guide and seat insert while ensuring a tight, consistent seal. The **polished stem** reduces the risk of galling or seizing, a common issue in high-performance engines where thermal cycling and lubrication demands are elevated. Additionally, the valve s **heat-treated construction** provides exceptional resistance to warping and distortion, even under prolonged high-temperature operation a key advantage for engines running modified camshafts, forced induction, or aggressive tuning setups. Whether installed in a naturally aspirated engine or a turbocharged application, this valve delivers consistent performance and longevity, making it a trusted choice for both restoration projects and performance modifications.

For enthusiasts and mechanics working on Mercedes-Benz engines from the late 1980s through the early 1990s, the **275-078-03-49 valve** represents a high-quality, direct replacement part that adheres to OEM specifications while offering improved resilience compared to aftermarket alternatives. Its compatibility with a range of engine variants, from the **M116 3.0L V6** to the **M119 5.0L V8**, ensures versatility for a broad spectrum of applications. When paired with a matching **valve spring, retainer, and keeper**, this valve contributes to a more responsive and efficient combustion process, reducing carbon buildup and improving overall engine health. Whether used in a classic restoration or a modern performance build, its engineering ensures it meets the exacting standards expected from Mercedes-Benz s legacy of precision engineering.

### **Pros and Cons of Buying a Mercedes-Benz 275 (W123) with the 078-03-49 Valve Cover**

The **Mercedes-Benz 275 (W123) with the 078-03-49 valve cover** is part of the **M116 engine family**, specifically the **2.7-liter inline-six (M116.930)** found in models like the **275 E, 275 E 4-Matic, and 275 SE**. This engine was produced between **1980 and 1985** and is known for its reliability, classic appeal, and strong aftermarket support. Below is a detailed breakdown of its advantages and drawbacks.

---

### **Pros**

1. **Classic Mercedes-Benz Build Quality**

- The W123 generation is widely regarded as one of Mercedes most durable and well-engineered models. The **M116 engine** was designed for longevity, with robust construction and high-quality materials.

- Many examples still run reliably after **300,000 miles** with proper maintenance.

2. **Strong and Reliable Engine**

- The **2.7L inline-six** produces **163 170 hp** (depending on model year and tuning), which is adequate for daily driving and light towing.

- The engine is **overhead valve (OHV)**, meaning it has a simpler valvetrain compared to modern overhead camshaft (OHC) designs, reducing wear and tear over time.

- The **078-03-49 valve cover** is a common part, indicating a well-supported engine variant.

3. **Proven Durability**

- With **regular maintenance (oil changes, timing belt checks, and valve adjustments)**, many M116 engines last **200,000 300,000 miles**.

- The **block and crankshaft** are robust, and major failures (like engine seizures) are rare if the car is well-maintained.

4. **Strong Aftermarket Support**

- Parts like **valve covers, gaskets, and timing components** are widely available, both new and aftermarket.

- Tuning options (e.g., **Holley, Weber, or modern ECU remaps**) can significantly improve performance.

- Classic Mercedes-Benz specialists and forums (e.g., **W123.net, MercedesBenzFans.com**) provide extensive troubleshooting and restoration guides.

5. **Classic Mercedes Appeal**

- The W123 is a **cult favorite** among classic car enthusiasts, with a strong following for restoration and modification.

- Owning one allows participation in **shows, rallies, and club events**, adding social and hobbyist value.

- The **timeless design** (especially in **275 SE or 275 E 4-Matic** form) makes it a desirable collector s item.

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

- **Fuel efficiency** is decent for its time ( 12 15 MPG city, 16 20 MPG highway).

- **Insurance costs** are often lower than for newer luxury cars, especially if the car is older and has a low mileage.

- **Basic maintenance** (oil changes, spark plugs, filters) is affordable compared to modern Mercedes-Benz models.

7. **Potential for Modifications & Restorations**

- The engine can be **easily modified** for better performance (e.g., **porting, camshaft upgrades, turbocharging**).

- **Restoration projects** can significantly increase value, especially if the car is brought back to showroom condition.

- **4-Matic models** (all-wheel-drive versions) are particularly sought after and can be restored for rally or track use.

8. **Resale Value (For Well-Maintained Examples)**

- **Restored or low-mileage examples** hold their value well, especially in **275 SE or 275 E 4-Matic** form.

- **Rally-prepped or concours-level restorations** can sell for **$10,000 $30,000 **, depending on condition.

---

### **Cons**

1. **High Maintenance Requirements**

- **Valve adjustments** are **manual and time-consuming** (typically every **30,000 40,000 miles**), requiring a skilled mechanic.

- **Timing belt and water pump** must be replaced **every 60,000 80,000 miles** (failure can cause catastrophic engine damage).

- **Distributor and points** (if equipped) require periodic replacement ( every 60,000 miles).

- **Fuel system issues** (clogged injectors, bad fuel pumps) can develop over time, requiring **frequent cleaning or replacement**.

2. **Outdated Technology & Reliability Quirks**

- **No modern emissions controls**, meaning **no OBD-II diagnostics** troubleshooting requires **vacuum gauges, multimeter, and mechanical knowledge**.

- **Vacuum leaks** are common due to aging hoses and gaskets, leading to **rough idling or stalling**.

- **Water pump failures** can cause **overheating**, and the **thermostat** may stick open or closed.

- **Suspension wear** (ball joints, bushings, shocks) is common, requiring **frequent replacements** for a smooth ride.

3. **Fuel & Emissions Challenges**

- **Modern fuel standards** (higher ethanol content) can **clog carburetors or fuel injectors** in older engines.

- **No catalytic converter** (in most cases), but some later models may have them, requiring **special fuel additives**.

- **Smog checks** (in some states) can be difficult due to **lack of OBD-II compliance**.

4. **Parts Availability & Costs**

- While **common parts** (valve covers, gaskets, belts) are affordable, **rare or discontinued components** (e.g., **specific sensors, wiring harnesses**) can be **expensive or hard to find**.

- **Replacement engines** are available but can cost **$3,000 $6,000 **, depending on condition.

- **Labor costs** for classic Mercedes work can be **higher than for modern cars** due to specialized knowledge.

5. **Driving Experience Limitations**

- **Manual transmissions** (if equipped) can be **fussy** in stop-and-go traffic.

- **Automatic transmissions** (in later models) may develop **slippage or rough shifting** over time.

- **No modern safety features** (airbags, ABS, traction control), making it **less safe in modern driving conditions**.

- **Heating/AC systems** can be **inefficient** and may require **frequent refrigerant top-ups**.

6. **Potential for Hidden Issues**

- **Rust** (especially in **frame rails, subframe, and wheel wells**) is common in older W123s, requiring **expensive repairs**.

- **Electrical gremlins** (bad ground wires, corroded connectors) are frequent and can be **time-consuming to diagnose**.

- **Timing chain stretch** (in later M116 variants) can cause **valve float**, leading to **knocking noises and reduced power**.

- **Blown head gaskets** (though rare) can cause **coolant leaks, white smoke, and overheating**.

7. **Insurance & Legal Restrictions**

- **Classic car insurance** is often **more expensive** than standard auto insurance, especially for high-value restorations.

- **Some states require modern safety equipment** (e.g., **rearview cameras, backup sensors**), which may not be retrofittable.

- **Rally or street-legal modifications** may require **homologation or emissions compliance**, adding complexity.

8. **Not a Daily Driver for Everyone**

- **Slow acceleration** (especially in manual form) can be frustrating in modern traffic.

- **Comfort compared to modern cars** is lacking **noisy cabin, stiff ride, and less refined handling**.

- **Fuel economy** is **worse than modern hybrids or electric cars**, making it **less practical for long commutes**.

---

### **Ending Conclusion**

The **Mercedes-Benz 275 (W123) with the 078-03-49 valve cover** is a **fantastic choice for enthusiasts** who appreciate **classic engineering, restoration projects, and the joy of driving a well-maintained vintage luxury car**. It offers **durability, strong aftermarket support, and a cult-like following**, making it a **wise investment for collectors and modifiers**.

However, it is **not a low-maintenance or high-convenience vehicle**. **Regular mechanical attention, patience with repairs, and a willingness to invest time and money in upkeep** are **essential**. If you are **not prepared for the challenges of classic car ownership** such as **manual valve adjustments, timing belt replacements, and electrical troubleshooting** this may not be the right purchase.

For the **right buyer** (someone who enjoys **restoring, modifying, or simply owning a piece of automotive history**), the **

Details:

Electrical parts are not returnable. Parts must be resealable and in the original packaging. Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer.

part #: 2750780349 prices

• $205.41-$297.04

specifications carfuelinjector:

• for makes: Mercedes
• mpn: 275-078-03-49
• part type: Valve
• genuine oem: Yes
• manufacturer warranty: 1 Year
• fitment type: Direct Replacement
• parts included: Only Part Reference 0 On The Diagram Is Included

shipping carfuelinjector:

• carrier: FedEx
• class: Standard
• service: FedEx Ground / FedEx Home Delivery
• cost: $14.00
• type: Fixed
• transit: 4-8 Days

seller carfuelinjector:

• city: Farmington, Utah
• # reviews: 1194
• rating: 99.2%

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offer carfuelinjector:

• options: Ship-to-home
• started: March 9, 2026
• quantity: 4
• availability: In Stock
• sold: 0

general carfuelinjector:

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

returns carfuelinjector:

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

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