NISSAN 110408H301 Cylinder Head 2.5L

( Manufacturer Part Number: 110408H301 ), ( Part Type: Cylinder Head ), ( Id: F38fe8d0-4687-4f61-95ca-1cb6093edc36 ), ( Interchange: 306-59133 )

Review NISSAN Cylinder Head Assembly Oem 2.5l fits ALTIMA 2002–2006

The **Nissan 110408H301 cylinder head** is a precision-engineered component designed exclusively for the **2.5L QR25DE engine** found in **2002 2006 Nissan Altima** models, including both the **SE and SL trim levels**. This cast aluminum head features a **four-valve, dual overhead camshaft (DOHC) design**, delivering optimal airflow and combustion efficiency for smooth, responsive performance. The head incorporates **intake and exhaust valves** with **stainless steel stems** and **sodium-filled exhaust valves** to enhance durability and heat dissipation, ensuring reliable operation under high-stress conditions. The **pushrod-actuated camshafts** are housed in a robust **cam cover** with a **sealed gasket interface**, preventing oil leaks and maintaining internal cleanliness. This head is compatible with **Nissan s 10-valve intake manifold** and **dual exhaust manifolds**, providing a balanced flow of air-fuel mixture for improved throttle response and fuel economy. Built to meet **Nissan s strict quality standards**, the 110408H301 is machined with **precision tolerances** to ensure proper sealing with the **cylinder block** via the **head gasket**, reducing the risk of coolant or oil leaks. Whether replacing a worn or damaged head due to overheating, warping, or internal failure, this genuine Nissan part guarantees **OEM-level performance** and **long-term reliability**, making it an essential upgrade for enthusiasts seeking to restore or enhance their Altima s engine performance. Proper installation requires **torque specifications** (typically **80 90 ft-lbs** for the head bolts) and **sealing compounds** to prevent future issues, ensuring a seamless fit and optimal engine function.

**Pros and Cons of Buying a 2002-2006 Nissan Altima 2.5L Cylinder Head (Part Number: 110408H301)**

### **Pros**

1. **OEM Quality and Fit** This is a genuine Nissan part, meaning it is designed to match the original specifications of your engine. It should fit perfectly without modifications and maintain the factory performance and reliability expectations.

2. **Reliability** Nissan s 2.5L QR25DE engine (used in these Altimas) is known for durability when properly maintained. A new cylinder head ensures no internal leaks, proper valve sealing, and correct combustion chamber integrity.

3. **Prevents Long-Term Damage** Ignoring head gasket failure, warping, or valve issues can lead to catastrophic engine damage (e.g., blown head gasket, warped deck, or valve damage). Replacing the head proactively avoids costly repairs down the line.

4. **Improved Performance** A properly installed head ensures optimal airflow, compression, and fuel efficiency. If the original head was damaged (e.g., from overheating or improper maintenance), replacing it can restore or even enhance engine performance.

5. **Warranty Coverage** If purchased from a reputable dealer or online retailer, this part may come with a warranty (e.g., 1-year limited warranty), providing peace of mind against manufacturing defects.

6. **Compatibility with Aftermarket Upgrades** If you plan to modify your engine (e.g., forced induction, camshaft upgrades), a fresh cylinder head is a prerequisite for safe and effective tuning.

7. **Resale Value** A well-maintained Altima with a new cylinder head will hold its value better than one with known head issues, making it more attractive to potential buyers.

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### **Cons**

1. **Cost** A genuine Nissan cylinder head is more expensive than aftermarket alternatives (e.g., from brands like Fel-Pro, Scati, or JE). Prices typically range from **$300 $600 **, depending on the source and whether labor is included.

2. **Labor-Intensive Installation** Replacing a cylinder head requires removing the engine from the vehicle (or at least the head itself), which involves:

- Disconnecting fuel lines, hoses, and electrical components.

- Removing the intake manifold, exhaust manifold, and valve cover.

- Machining the head deck if warped (may add $100 $300 in labor).

- Replacing head gaskets, bolts, and seals (often sold separately).

- Torquing bolts to Nissan s strict specifications (over-torquing can warp the head).

- **Labor costs** for this job can range from **$800 $1,500 **, depending on the shop and location.

- The engine block is warped (requiring resurfacing, adding cost).

- The crankshaft or camshaft are worn (may need replacement).

- The timing chain/belt is stretched or damaged (common in QR25DE engines).

- The pistons or valves show excessive wear (may require polishing or replacement).

4. **Aftermarket Parts May Be Cheaper** While not OEM, aftermarket heads (e.g., from **Scati, JE, or Fel-Pro**) can be **30 50% cheaper** and are often just as reliable, especially if sourced from a reputable brand. However, they may not include the same warranty or exact factory tolerances.

- Coolant or oil leaks.

- Head gasket failure (even with a new head).

- Reduced compression and power loss.

- Voiding warranties if the shop is not authorized.

6. **Timing Chain Wear** The QR25DE engine uses a timing chain, which is prone to stretching over time. If the chain is worn, replacing just the head may not solve long-term reliability issues. A **timing chain kit** ($200 $400) may be needed simultaneously.

7. **Depreciation of the Vehicle** If the Altima is older and has high mileage, replacing just the head may not justify the cost of a full engine rebuild or a newer vehicle. A cost-benefit analysis is wise.

---

### **Conclusion**

- The head is **warped, cracked, or leaking** (common signs: overheating, white smoke from exhaust, coolant in oil, or compression loss).

- You **plan to keep the vehicle long-term** and want to avoid catastrophic engine failure.

- You are **prepared for the labor cost** and potential additional repairs (e.g., timing chain, gaskets).

- The **total cost (part labor) is justified** by the vehicle s remaining value or your attachment to it.

- The vehicle has **extremely high mileage (200,000 miles)** with no maintenance history.

- The **engine has other major issues** (e.g., rod knock, blown head gasket history, or a stretched timing chain).

- You **cannot afford the labor cost** or are unsure about DIY installation.

- A **new or used reliable car** is a more practical option.

Then, **weigh the costs carefully** sometimes a **full engine rebuild, a used engine swap, or purchasing a different vehicle** may be more economical in the long run.

---

### **Recommendation**

1. **Verify the Need** Confirm the issue is **only the cylinder head** (not the block, timing chain, or other components). Get a **compression test** and **leak-down test** to isolate the problem.

2. **Choose the Right Part**

- **Genuine Nissan (110408H301)** if you want **exact factory specs** and warranty.

- **Aftermarket (Scati, JE, or Fel-Pro)** if you want to **save money** and the brand is reputable.

- **Used/Rebuilt Head** (from a trusted source) if you re on a tight budget (but risk quality control).

3. **Budget for Labor**

- Get **multiple quotes** from shops experienced with Nissan engines.

- Consider **DIY** if you have mechanical skills (but be prepared for challenges like torque specs and gasket seating).

- Factor in **additional costs** (timing chain, gaskets, seals, machining if needed).

4. **Consider Alternatives**

- If the engine is **beyond 150,000 180,000 miles**, a **used engine swap** (e.g., from a junkyard or engine dealer) may be cheaper than a full rebuild.

- If the car is **not worth much**, decide whether the repair is worth the investment.

5. **Proceed with Caution**

- If you choose to replace the head, **use high-quality gaskets** (Fel-Pro or Scati) and **follow Nissan s torque sequence strictly**.

- **Break in the engine properly** after installation to avoid premature wear.

- **Monitor for leaks or performance issues** post-repair.

If the cylinder head is the **only major issue** and you re committed to the vehicle, **replacing it is the best long-term solution** to prevent engine failure. However, if the car is **past its prime**, a **cost-benefit analysis** is essential sometimes walking away is the smarter financial choice.

Details:

Search for more parts NISSAN ALTIMA. Cylinder Head.

part #: 110408h301 prices

• $450.87-$498.75

specifications cylinderheapar:

• for models: Altima
• for makes: Nissan
• for years: 2002-2006
• mpn: 110408h301
• part type: Cylinder Head
• id: F38fe8d0-4687-4f61-95ca-1cb6093edc36
• interchange: 306-59133

payments cylinderheapar:

• credit card: Discover
• other
• wallet: Paypal

seller cylinderheapar:

• city: Brush, Colorado
• # reviews: 14384
• rating: 99.3%

shipping cylinderheapar:

• type: Fixed
• transit: 3-7 Days
• cost: $0.00
• service: Standard
• class: Standard

offer cylinderheapar:

• sold: 0
• best offers: True
• options: Ship-to-home
• availability: In Stock
• started: February 17, 2026
• quantity: 1

general cylinderheapar:

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

returns cylinderheapar:

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

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