1. Cylinder Heads & Parts Engines Components For Sale
  2. sku: 11779880904122741
  3. KIA K2N5

KIA K2N5 Dohc Head 1.8

fits make: Kia.

K2n5 Kia 1.8 Dohc Head

( Manufacturer Part Number: K2N5 ), ( Type: Cylinder Head ), ( Core Charge: 250.00 Per Core That Isnt Returned ), ( Fitment Type: Direct Replacement ), ( Material: Aluminum ), ( Vintage Part: No ), ( Finish: Pcd )

Review KIA 1.8 Dohc Head

The **Kia K2N5 1.8L DOHC engine** is a meticulously engineered inline-four cylinder powerplant designed to deliver a compelling balance of performance, efficiency, and reliability, making it a standout choice for both original equipment manufacturers (OEMs) and aftermarket tuners alike. Built upon Kia s robust **Gamma II** platform, this naturally aspirated engine features a **double overhead camshaft (DOHC)** configuration with four valves per cylinder, ensuring optimized airflow and improved combustion efficiency. The cylinder head is crafted from high-quality cast iron, providing exceptional durability while maintaining a lightweight structure to enhance overall drivetrain responsiveness. At its core, the K2N5 is powered by a **1.8-liter displacement**, achieved through precise bore and stroke dimensions of **77.0mm x 86.9mm**, striking a near-perfect balance between torque and high-revving capability. The engine s **multi-point fuel injection system**, paired with a **throttle body with variable intake control (VIC)**, allows for precise air-fuel ratio management, reducing emissions while maximizing power output typically producing around **120 140 horsepower and 110 120 lb-ft of torque** in its stock form, depending on the application.

One of the most distinguishing features of the K2N5 is its **intercooled turbocharged potential**, as it was originally conceived as a **turbocharged** variant (designated as the **K2N5T**) before being adapted for naturally aspirated use. This means the head is inherently strong enough to handle forced induction, with reinforced components such as **high-strength cylinder head studs, a robust intake manifold design, and a robust block construction** that can accommodate boost pressures when properly supported. The **DOHC architecture** incorporates **hydraulic valve lifters**, reducing maintenance needs while allowing for smooth, high-revving operation ideal for both daily driving and spirited performance applications. The engine s **fuel system** is equipped with **high-flow injectors** and a **sequential fuel delivery system**, ensuring consistent power delivery across the rev range, while the **variable intake control (VIC)** system dynamically adjusts airflow for improved throttle response and efficiency.

Under the hood, the K2N5 s **cylinder head** stands out with its **four-valve-per-cylinder design**, featuring **intake and exhaust valves** with **stainless steel stems** and **titanium or sodium-filled exhaust valves** in some variants, enhancing heat dissipation and longevity. The **camshaft profile** is tuned for a **peppy mid-range torque curve**, making it well-suited for both city driving and highway cruising, while its **high redline (approximately 7,000 7,500 RPM)** allows for spirited acceleration when paired with the right drivetrain. The engine s **oil system** is robust, featuring **high-capacity oil pumps** and **pressure relief valves** to ensure consistent lubrication under demanding conditions, while the **cooling system** incorporates a **thermostat-controlled radiator** and **high-flow water pump** to prevent overheating, even during aggressive driving or forced induction modifications. Additionally, the K2N5 s **exhaust manifold design** promotes efficient scavenging, reducing backpressure and improving exhaust flow an attribute that makes it a favorite among tuners looking to push performance boundaries.

From a **build quality perspective**, the K2N5 is renowned for its **durability and cost-effectiveness**, making it a popular choice for **Kia Soul, Kia Forte, and Hyundai Accent** applications, as well as aftermarket builds where reliability and mod potential are key. The engine s **cast iron block** provides excellent heat retention and resistance to warping, while the **aluminum cylinder head** keeps weight in check without sacrificing strength. When properly maintained with regular **oil changes, timing belt inspections, and coolant flushes** the K2N5 can easily exceed **200,000 miles** with minimal issues, offering an exceptional value proposition compared to many of its competitors. For those looking to **enhance performance**, the K2N5 responds exceptionally well to **turbocharging, supercharging, or direct port fuel injection (DPFI) upgrades**, with aftermarket support ranging from **intake and exhaust upgrades** to **full engine rebuild kits** and **high-flow heads**. Whether used in its stock form or as a foundation for a **high-performance build**, the Kia K2N5 1.8L DOHC engine remains a **versatile, dependable, and cost-efficient powerplant** that continues to earn its reputation as a tuner s favorite.

Buying a Kia K2N5 1.8 DOHC head (also known as the **G4GC engine**) for a project car, restoration, or engine rebuild can be a cost-effective choice, but it comes with several considerations. Below is a detailed breakdown of the pros and cons, followed by a conclusion and recommendation.

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### **Pros of Buying a Kia K2N5 1.8 DOHC Head**

1. **Common and Affordable**

The K2N5 engine (used in Kia Spectra, Cerato, and some Hyundai models) is one of the most widely available small-displacement engines in its class. This means parts, heads, and labor are generally cheaper than more exotic or rare engines. You can often find used heads for a fraction of the cost of a new or high-performance aftermarket alternative.

2. **Proven Reliability (When Maintained Properly)**

The G4GC engine, when kept up with regular maintenance (oil changes, valve adjustments, timing belt replacement), is known for lasting well over 200,000 miles in stock form. Many owners report few major issues if basic upkeep is followed.

3. **Aftermarket Support**

There is a strong aftermarket presence for this engine, including:

- **Performance heads** (e.g., KW, JE, or aftermarket ported heads)

- **Intake and exhaust upgrades** (e.g., K&N, Borla, or MagnaFlow)

- **Tuning options** (e.g., Haltech, Link, or standalone ECU tuning)

- **Forced induction potential** (turbocharging or supercharging kits exist, though stock internals may need reinforcement)

This makes it easier to modify and improve performance without being limited by a lack of parts.

4. **Simple Design**

The G4GC is a relatively straightforward engine with:

- **DOHC (Dual Overhead Camshaft)** design, which is easier to work on than some older SOHC engines.

- **No complex variable valve timing** (unlike some newer engines), reducing potential failure points.

- **Mechanical fuel injection** (not direct injection), which is simpler to modify and tune.

5. **Good for Beginners**

If you're new to engine work, the K2N5 is a good learning project because:

- It s not overly complex.

- Tools required are common (e.g., torque wrench, basic hand tools).

- There are plenty of online resources, forums (e.g., KiaTech, Hyundai-Tech), and YouTube guides.

6. **Potential for Modifications**

With the right upgrades, you can achieve decent power gains:

- **Stock tune intake/exhaust**: 120 150 hp (from 110 hp stock).

- **Ported heads camshafts tune**: 150 180 hp.

- **Turbocharged (with internals upgraded)**: 200 hp is achievable with proper support.

This makes it a flexible platform for both daily driving and light performance builds.

7. **Fuel Efficiency**

The stock engine is reasonably efficient ( 25 30 MPG in a well-tuned car), which is good for a small-displacement 4-cylinder.

8. **Resale Value of Parts**

Since the engine is common, parts (even used ones) hold value better than rare or discontinued components. This means you can often sell or trade in parts easily if you decide to upgrade later.

---

### **Cons of Buying a Kia K2N5 1.8 DOHC Head**

1. **Timing Belt and Water Pump Failure Risk**

One of the most common issues with the G4GC is **timing belt and water pump failure**, often leading to catastrophic engine damage if it snaps. Many failures occur between **80,000 120,000 miles**, though some engines last longer if maintained. Always check the timing belt tensioner, pulleys, and water pump for wear before purchasing a used head or engine.

2. **Valvetronic Actuator (Electronic Throttle) Issues**

The G4GC uses a **Valvetronic actuator** (a small motor that adjusts throttle plate position). These can fail, causing stalling, rough idle, or no-start conditions. Replacing them is relatively cheap ( $50 $100), but it s another potential failure point.

3. **Oil Leaks**

The **valve cover gasket**, **oil filter housing gasket**, and **oil pan gasket** are common leak points. These are easy to fix but require attention to detail during assembly.

4. **Head Gasket Failures**

While less common than in some other engines, **head gasket leaks** can occur, especially if the engine was overheated or not properly torqued during assembly. Always check for coolant in the oil or oil in the coolant when inspecting a used head.

5. **Camshaft Wear**

The stock camshafts are not aggressive, but they can wear over time, leading to **valve float or reduced performance**. Replacing them with aftermarket cams (e.g., KW, JE) can improve power but may require a tune to avoid drivability issues.

6. **Stock Power Output is Low**

The stock G4GC produces only ** 110 120 hp**, which is adequate for daily driving but not impressive for performance enthusiasts. If you're looking for a high-power platform, you ll need to invest in upgrades (turbo, heads, tune) to reach meaningful power levels.

7. **Timing Chain (In Some Models)**

Some later G4GC engines (especially in Hyundai models) use a **timing chain** instead of a belt. While chains last longer, they can stretch over time, leading to timing issues. If you're buying a used head, confirm whether it s a belt or chain drive.

8. **Limited Turbo Potential Without Reinforcement**

While turbocharging is possible, the stock **crankshaft, connecting rods, and pistons** are not built for high boost. Without reinforcement (e.g., forged internals, stronger rods), you risk engine failure under heavy loads. This adds cost if you want to go that route.

9. **Electrical Gremlins**

The G4GC has been known to have **intermittent electrical issues**, such as:

- Faulty **oxygen sensors** (common failure point).

- **Check engine lights** due to minor codes (e.g., O2 sensor, valve position sensor).

- **Starter or alternator failures** (common in older models).

These are usually fixable but can be annoying if not addressed.

10. **Depreciation and Reliability Concerns**

While the engine itself is reliable, the **transmission (5-speed manual or automatic)** and **suspension** in older Kia/Hyundai models can be weak points. If you're buying a complete car for the engine, factor in potential transmission or suspension repairs.

11. **Limited High-RPM Performance**

The stock engine is **not rev-happy** and peaks around **6,000 6,500 RPM**. This can make it feel sluggish compared to modern turbocharged or high-revving engines.

12. **Emissions Compliance**

If you're building a car for street use, ensure the engine meets **emissions standards** in your region. Some aftermarket modifications (e.g., high-flow exhaust) may require a **smog tune** or **DTC (Diagnostic Trouble Code) fixes** to pass inspections.

---

### **Conclusion**

The **Kia K2N5 1.8 DOHC head (G4GC engine)** is a **solid, budget-friendly choice** for project cars, restorations, or light performance builds, especially for beginners. Its **wide availability of parts, aftermarket support, and mod potential** make it an attractive option if you're willing to put in the work. However, **timing belt/water pump failure, oil leaks, and valvetronic actuator issues** are common pitfalls that require vigilance during maintenance.

If you're **mechanically inclined and willing to invest time in upkeep**, this engine can be a **great platform for upgrades**, whether you're tuning it naturally or adding forced induction. For **casual drivers or those seeking high power out of the box**, it may not be the best choice due to its stock limitations.

---

### **Recommendation**

1. **If you're buying a used head:**

- **Inspect thoroughly** for cracks, warping, or signs of overheating.

- **Check the timing belt, tensioner, and water pump** replace if worn.

- **Test the head for leaks** (pressurize with coolant and check for bubbles in the oil).

- **Verify the condition of the camshafts, lifters, and valves** (replace if worn).

- **Consider porting or polishing** the stock head for better airflow ( 10 15% power gain).

2. **If you're building a project car:**

- **Pair it with a reliable transmission** (e.g., a rebuilt 5-speed manual or a strong automatic).

- **Upgrade the intake and exhaust** early for better throttle response.

- **Install a tune** (even a basic one) to optimize stock power.

- **Consider a turbo kit** (if you want more power) but

Details:

Head has been gone through and resurfaced.

part #: k2n5 prices

  • $350.00-$499.99

specifications cylinderheapar:

  • for makes: Kia
  • mpn: K2n5
  • type: Cylinder Head
  • core charge: 250.00 Per Core That Isnt Returned
  • fitment type: Direct Replacement
  • material: Aluminum
  • vintage part: No
  • finish: Pcd

offer cylinderheapar:

  • options: Ship-to-home
  • best offers: True
  • availability: In Stock
  • quantity: 1
  • sold: 0
  • started: March 24, 2026

general cylinderheapar:

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

seller cylinderheapar:

  • city: Holyoke, Massachusetts
  • rating: 100.0%
  • # reviews: 435

payments cylinderheapar:

  • other
  • credit card: Visa
  • wallet: Google-pay

shipping cylinderheapar:

  • service: FedEx Ground / FedEx Home Delivery
  • transit: 3-8 Days
  • class: Standard
  • carrier: FedEx
  • cost: $133.26
  • type: Calculated

returns cylinderheapar:

  • policy: No Returns
for makes: kia, type: cylinder head, core charge: 250.00 per core that isnt returned, fitment type: direct replacement, vintage part: no, finish: pcd,
category: auto parts > car truck parts accessories > engines engine parts > cylinder heads, material: aluminum, sku: 11779880904122741,
Kia K2N5 Is Similar To:
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3 offers $350.00–$499.99 USD
  • Remanufactured. Offer #1 priced at $350.00 + $136.78 shipping estimate = $486.78* total. Head has been gone through and resurfaced.+$136.78 shipping
  • Remanufactured. Offer #2 priced at $419.99 + $100.00 shipping estimate = $519.99* total. - New valve stem seals installed on all our heads & all valve guides are replaced with new ones as necessary.+$100.00 shipping
  • Remanufactured. Offer #3 priced at $499.99 + $42.81 shipping estimate = $542.80* total. New valve seals installed, cam seals not included. Casting# .+$42.81 shipping

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