MERCEDES 129-010-16-20 Cylinder Head Benz 1290180301 W113

( Manufacturer Part Number: 129-010-16-20 ), ( Type: Cylinder Head ), ( Oe/oem Part Number: 129-018-03-01 ), ( Material: Aluminum ), ( Vintage Part: Yes ), ( Country Of Origin: Germany ), ( Performance Part: No )

Review MERCEDES benz Cylinder Head 1290101620 fits 250SE 250SL M129 W111 W108

The **Mercedes-Benz 129-010-16-20 (250SE/250SL) M129 Cylinder Head (Part Numbers: 1290180301, 1290101620)** is a meticulously engineered component designed exclusively for the iconic **W111 (250SE), W113 (250SL Roadster), and W108 (250SL Coup )** models, all of which were powered by the legendary **M129 inline-six engine**. This cylinder head is a critical part of the engine s performance, reliability, and longevity, ensuring optimal combustion, cooling, and valve operation. Crafted from high-quality cast aluminum with precision machining, this head features a **dual overhead camshaft (DOHC) design**, allowing for efficient valve timing and improved airflow through the combustion chambers. The head is equipped with **four valves per cylinder** (two intake and two exhaust), each controlled by robust rocker arms and hydraulic lifters, which eliminate the need for manual adjustment and reduce wear over time. The **intake and exhaust ports** are carefully contoured to maximize volumetric efficiency, contributing to the engine s smooth and responsive power delivery characteristic of the M129 s reputation for refined performance. Additionally, the head includes **integrated spark plug wells** and **camshaft covers**, which are sealed with high-temperature gaskets to prevent oil leaks and maintain internal pressure. This component is fully compatible with the **250SE (1968 1972), 250SL Roadster (1968 1971), and 250SL Coup (1968 1971)**, making it an essential replacement for engines experiencing issues such as overheating, misfires, or valve train wear. Whether restoring a classic Mercedes-Benz to its original glory or upgrading an existing engine, this cylinder head ensures peak performance while preserving the timeless engineering legacy of the M129.

### **Pros and Cons of buying a Mercedes-Benz 129-010-16-20 (250SE/250SL M129 Cylinder Head)**

#### **Overview**

The **Mercedes-Benz 129-010-16-20** (also known as **1290180301** or **1290101620**) is a cylinder head for the **M129 engine**, found in **W111 (250SE), W113 (250SL), and W108 (250SEL) models** from the late 1960s to early 1970s. This part is highly sought after by classic car enthusiasts, but it comes with both advantages and challenges.

---

### **Pros**

1. **Performance Potential**

- The M129 engine is a **high-performance inline-six** with a **compression ratio of 10.5:1**, making it capable of running on **high-octane fuel** for better power output.

- With proper tuning, **camshaft upgrades, and a high-flow exhaust**, this engine can produce **180 200 horsepower**, significantly improving acceleration and top speed compared to stock.

- The **pushrod design** allows for **easy modifications**, including **big valves, high-lift cams, and porting**, which can enhance breathing and power.

2. **Classic Mercedes-Benz Prestige**

- Owning a **W111 250SE, W113 250SL, or W108 250SEL** with a well-maintained M129 engine carries **timeless prestige** in the automotive world.

- These cars are **iconic**, particularly the **Pagoda SL (W113)**, which is one of the most desirable Mercedes-Benz models ever made.

- The **sleek, aerodynamic design** of the W111 and W108 makes them stand out on the road.

3. **Strong Aftermarket Support**

- The M129 engine has a **large enthusiast community**, meaning **parts, manuals, and tuning guides** are widely available.

- **Replacement cylinder heads, intake manifolds, and camshafts** can be sourced from specialty suppliers.

- **Restoration and modification kits** are plentiful, making it easier to keep the engine running smoothly.

4. **Durability with Proper Maintenance**

- When **correctly maintained**, the M129 engine can last **decades** with **regular valve adjustments, oil changes, and minor repairs**.

- The **cast-iron block and head** are robust, though they require **careful attention to cooling and lubrication**.

- Many original M129 engines still run in **high-mileage cars** with proper upkeep.

5. **Investment Potential**

- **Well-preserved W111 250SEs, W113 250SLs, and W108 250SELs** appreciate in value, especially in **restored or concours condition**.

- The **250SL Pagoda** is particularly valuable, with **restored examples selling for $100,000 $300,000 ** depending on condition.

- The **M129 engine itself** is a **collector s item**, with **rare or restored heads** fetching high prices in the aftermarket.

6. **Driving Experience**

- The M129 engine provides a **smooth, refined power delivery** with **good mid-range torque**, making it enjoyable to drive.

- The **W113 250SL** is particularly **lightweight and nimble**, offering **excellent handling** for its era.

- The **W111 250SE** has a **luxurious, spacious interior**, making it a comfortable daily driver if modified appropriately.

---

### **Cons**

1. **High Maintenance Requirements**

- The M129 engine is **notoriously finicky** and requires **frequent attention** to stay reliable.

- **Valve adjustments** must be done **every 10,000 15,000 miles** (or as recommended by the manufacturer) to prevent **valve float and loss of power**.

- **Oil changes must be done on schedule** using **low-quality oil or neglecting changes** can lead to **premature wear** of the **camshaft lobes and lifters**.

- **Cooling system issues** (water pump, thermostat, hoses) are common and must be **monitored closely** to prevent **overheating and head gasket failure**.

2. **Common Failure Points**

- **Head gasket leaks** are a **major issue**, often caused by **overheating, poor cooling, or detonation**.

- **Camshaft wear** can occur if **oil pressure is insufficient** or **lifters are not adjusted properly**.

- **Rod bearings and main bearings** can fail if the engine is **over-revved or not properly lubricated**.

- **Distributor and ignition issues** (common in older M129 engines) can lead to **rough idling and misfires**.

3. **Cost of Repairs and Restoration**

- **Replacement parts** (especially **original or high-quality aftermarket cylinder heads, manifolds, and gaskets**) can be **expensive**.

- **Labor costs** for restoration are high due to the **specialized nature of classic Mercedes-Benz mechanics**.

- **Full engine rebuilds** can cost **$5,000 $15,000 **, depending on the extent of damage.

- **Electrical and fuel system upgrades** (modern ignition, fuel injection conversion) add to the cost.

4. **Fuel and Emissions Challenges**

- The M129 engine **requires high-octane fuel (100 octane)** to prevent **detonation**, which is **more expensive** than modern gasoline.

- **Smog and emissions regulations** may make it **difficult to register** in some areas unless **modified with a modern catalytic converter and emissions system**.

- **Lead-free fuel** can cause **carbon buildup** in the combustion chambers, requiring **regular decarbonization**.

5. **Availability of Parts**

- While the aftermarket supports the M129, **some parts are discontinued or hard to find**.

- **Original Mercedes-Benz parts** (especially for older models) can be **expensive or require sourcing from specialty dealers**.

- **Reproduction or aftermarket parts** may not always match **original quality**, leading to **potential reliability issues**.

6. **Driving Limitations**

- The **W111 and W108** are **heavy and slow** compared to modern cars, with **top speeds around 100 110 mph** (even with modifications).

- **Braking and suspension** are **basic by today s standards**, requiring **regular maintenance** to ensure safety.

- **Modern traffic and road conditions** can be **challenging** for these older cars, especially in **urban environments**.

7. **Insurance and Storage Costs**

- **Classic car insurance** for a **W111/W113/W108** can be **expensive**, especially if modified.

- **Storage costs** (garage, climate-controlled facility) add to the **ongoing expenses** of owning a classic Mercedes.

- **Transportation for shows or events** can be **costly**, requiring **specialized trailers or towing**.

---

### **Conclusion**

Buying a **Mercedes-Benz 129-010-16-20 cylinder head (or a car with an M129 engine)** is a **rewarding but demanding** endeavor. The **pros** **high performance potential, classic prestige, strong aftermarket support, and investment value** make it an **exciting project** for enthusiasts. However, the **cons** **high maintenance, costly repairs, fuel requirements, and driving limitations** mean that this is **not a car for casual ownership**.

If you are **passionate about classic Mercedes-Benz, willing to invest time and money in maintenance, and enjoy the challenge of restoring and modifying an engine**, then the **M129 is an incredible choice**. On the other hand, if you **prioritize convenience, modern reliability, and lower ownership costs**, this may not be the right project.

---

### **Recommendation**

- **Purchase from a reputable dealer** with a **full inspection** to ensure **no cracks, warping, or internal damage**.

- **Consider a restored or rebuilt head** if you want **maximum reliability**, as **original heads may have hidden issues**.

- **Pair it with a well-maintained M129 engine** and **modern supporting components** (fuel injection, ignition, cooling system upgrades) to **maximize performance and longevity**.

- **Get a full mechanical inspection** before purchase, focusing on **head gaskets, camshaft condition, and cooling

Details:

Overall, the Cylinder Head is very clean, but i've never had it tested and don't know its history. I m selling it as a core and pricing accordingly. Threads for the spark plugs, Injectors, Rocker Arm Studs and Intake / Exhaust Manifolds are also in great shape. The Cylinder Heads manufacture date is 1966, and its valve seats bronze guides appear to be in excellent condition.

part #: 1290101620 prices

• $337.49-$625.00

specifications cylinderheapar:

• for models: 250se, 250sl, M129, W111, W108
• for makes: Mercedes
• mpn: 129-010-16-20
• type: Cylinder Head
• oe/oem part number: 129-018-03-01
• material: Aluminum
• vintage part: Yes
• country of origin: Germany
• performance part: No

payments cylinderheapar:

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

offer cylinderheapar:

• sold: 0
• availability: In Stock
• options: Ship-to-home
• best offers: True
• started: April 20, 2026
• quantity: 1

returns cylinderheapar:

• policy: No Returns

general cylinderheapar:

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

seller cylinderheapar:

• city: Tampa, Florida
• rating: 100.0%
• # reviews: 530

shipping cylinderheapar:

• service: FedEx Ground Economy
• type: Calculated
• class: Economy
• cost: $39.65
• carrier: FedEx
• transit: 4-10 Days

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