BMW Passenger Right Cylinder Head Dohc 306-59306R

( Part Type: Cylinder Head ), ( Conditions Options: Efi, Factory ), ( Genuine Oem: Yes ), ( Ipn: 306-59306r ), ( Placement: Passenger/right )

Review BMW Passenger Right Cylinder Head Dohc fits 545I 2004–2005

The **BMW 306-59306R Passenger-Side Cylinder Head (DOHC, 04-05 545i)** is a precision-engineered component designed to deliver the high-performance reliability synonymous with BMW s legendary inline-six architecture. This cylinder head, part of the **N62** engine family, is meticulously crafted to house the dual overhead camshafts (DOHC) that govern the intake and exhaust valve operation, ensuring optimal airflow and combustion efficiency. The head features **four valves per cylinder** (two intake and two exhaust) arranged in a high-lift, high-flow configuration, allowing for superior breathing and enhanced power delivery critical for maintaining the 545i s signature balance of torque and responsiveness. Constructed from **high-grade aluminum alloy**, it is both lightweight and durable, engineered to withstand the extreme thermal and mechanical stresses of high-performance driving while resisting warping under prolonged load. The **hydraulic valve lifters** and **solid roller rocker arms** ensure smooth, consistent valve operation without the need for frequent adjustments, contributing to the engine s reputation for quiet, vibration-free performance. This cylinder head is fully compatible with the **04-05 model year 545i**, featuring the correct **bolt pattern, valve cover, and camshaft timing components** to guarantee a seamless fit and optimal function. Whether restoring a classic 545i or upgrading an existing engine, this cylinder head represents a critical investment in longevity, performance, and the authentic BMW driving experience.

### **Pros and Cons of Buying a BMW 306-59306R Passenger-Side Cylinder Head (DOHC, 04-05 545i)**

1. **Performance Improvement** A high-quality replacement cylinder head can restore or enhance engine performance, especially if the original was damaged by overheating, warping, or internal failure. Properly rebuilt heads with new valves, springs, and seals can improve airflow, compression, and power output.

2. **Reliability and Durability** If the original head was failing due to wear (e.g., valve stem seals, rocker arms, or exhaust ports), a new or remanufactured head can prevent catastrophic engine failure (e.g., bent valves, blown head gasket, or valve float).

3. **Compatibility with Modifications** If you plan to modify your 545i (e.g., forced induction, camshaft upgrades, or high-flow intake/exhaust), a fresh cylinder head ensures the engine can handle increased stress without premature failure.

4. **Cost-Effective Alternative to Engine Replacement** Replacing just the cylinder head is far cheaper than a full engine rebuild or swap. For a 545i, which uses a V8 (N63 or N74 depending on model year), cylinder head issues can be isolated and fixed without overhauling the entire powerplant.

5. **Accessibility of Parts** BMW s 545i (especially the 2004-2005 N63 engine) has a dedicated aftermarket for cylinder heads, including remanufactured units from reputable suppliers. This makes sourcing a replacement easier than for some other high-end BMW engines.

6. **Potential for DIY Installation** While cylinder head work is complex, experienced DIYers with proper tools (torque wrench, valve spring compressor, gasket scraper, etc.) can install a new head themselves, saving labor costs.

- **Blown head gasket** (expensive to repair, especially in a V8).

- **Warped cylinder head** (requires machining or replacement).

- **Valvetronic or N54/N63-specific failures** (e.g., oil leaks, valve float, or exhaust port cracks).

---

1. **High Upfront Cost** A genuine BMW OEM cylinder head or a high-quality remanufactured unit (e.g., from **BMW Performance Parts, JE, or Summit Racing**) can cost **$1,500 $3,500 **, depending on condition and supplier. Additional costs include:

- **Valvetronic actuator** (if applicable, $500 $1,200).

- **New valves, springs, and retainers** ( $300 $800).

- **Head gasket** ( $200 $500).

- **Labor** (if not DIY, $1,000 $2,000 for professional installation).

- **Precision machining** (if the head is warped, it may need resurfacing).

- **Proper torque specifications** (over/under-torquing can cause leaks or warping).

- **Valvetronic calibration** (if the 545i has the Valvetronic system, recalibration may be needed).

- **Exhaust port sealing** (poor sealing can cause leaks and performance loss).

- **Mismatched parts** (e.g., wrong valve sizes, incorrect rocker arm ratios).

- **Poorly remanufactured heads** (porous casting, weak welds, or improper heat treatment).

- **No warranty** (some aftermarket sellers offer limited warranties, while others provide none).

- **Overheating** (may require coolant system flush, thermostat replacement, or radiator repair).

- **Oil contamination** (could mean crankcase ventilation or PCV system issues).

- **Exhaust port cracks** (may require exhaust manifold replacement or welding).

- **Valvetronic actuator failure** (requires replacement and recalibration).

- **Warped block** (requires decking).

- **Damaged pistons or valves** (may need replacement).

- **Rod or crankshaft issues** (if the engine was seized or misfired for a long time).

6. **Time-Consuming Process** A full cylinder head rebuild (including valve job, gasket replacement, and torque sequence) can take **10 20 hours** of labor, depending on experience. This may require removing the engine from the car, which adds complexity.

7. **Warranty and Recall Considerations** If the 545i is still under factory warranty, replacing the cylinder head may void coverage unless it s a **covered defect** (e.g., manufacturing flaw). BMW s extended warranties may not cover aftermarket parts.

---

Buying and installing a **BMW 306-59306R cylinder head (DOHC, 04-05 545i)** is a **necessary and often cost-effective solution** if the original head is failing. It prevents more severe engine damage and can restore performance, especially if combined with other upgrades. However, the process is **expensive, labor-intensive, and technically demanding**, requiring either **expert mechanical skill or professional installation**.

If the cylinder head is the **only major issue**, proceeding with replacement is justified. But if other engine components (e.g., pistons, crankshaft, or exhaust manifolds) are also compromised, a **full engine rebuild or swap** may be more economical in the long run.

---

- **Compression test** (low compression in one cylinder suggests head or valve problems).

- **Leak-down test** (identifies exhaust/intake leaks).

- **Visual inspection** (check for warping, cracks, or exhaust port damage).

- **Scan for codes** (e.g., misfire, overheating, or Valvetronic faults).

- **Genuine BMW OEM parts** (most reliable but expensive).

- **Remanufactured heads from trusted brands** (e.g., **BMW Performance Parts, JE, or Summit Racing**).

- **Avoid no-name or eBay mystery parts** unless you re certain of their quality.

3. **Consider Professional Installation** Unless you have **extensive engine experience**, hiring a **BMW specialist** (or a high-end performance shop) is wise to ensure:

- Proper torque sequence.

- Correct Valvetronic calibration (if applicable).

- No warping or gasket leaks.

- **Additional components** (e.g., new valves, springs, or exhaust manifolds).

- **Engine removal/installation** (if not doing it yourself).

- **Diagnostic testing** (to rule out other engine issues).

5. **Evaluate Long-Term Costs** If the engine has **high mileage (150,000 miles)** or **a history of overheating**, weigh whether a **cylinder head replacement alone is sufficient** or if a **full engine rebuild** is more practical.

- Parts used (serial numbers, supplier info).

- Torque specs and procedures followed.

- Any post-installation testing (compression, leak-down, drive cycle).

---

- The head is confirmed damaged (warped, cracked, or leaking).

- You have a **clear diagnosis** and a **budget for potential additional work**.

- You either have the **skills for DIY installation** or can afford **professional labor**.

- The engine has **multiple unresolved issues** (e.g., rod knock, oil leaks, or exhaust manifold cracks).

- You re unsure of the **exact cause of failure** (could be a symptom of deeper problems).

- The **cost exceeds the value of the vehicle** (especially for high-mileage examples).

For a **2004-2005 545i**, a cylinder head replacement is a **smart intermediate fix** but it should be part of a **larger engine maintenance plan** to ensure long-term reliability. If the engine is otherwise in good shape, this upgrade will **extend its life and improve performance**.

Details:

Some heads may need to be resurfaced. Cylinder Heads are not sold with the valve covers. No expedited shipping is available. We draw on more than 30 years of experience, and no part is too big or small to carry.

No time to stop in. Note: This is a USED head NOT new.

part #: 545i prices

• $102.00-$250.00

specifications cylinderheapar:

• for models: 545i
• for makes: Bmw
• for years: 2004-2005
• part type: Cylinder Head
• conditions options: Efi, Factory
• genuine oem: Yes
• ipn: 306-59306r
• placement: Passenger/right

payments cylinderheapar:

• other
• wallet: Paypal
• credit card: Visa

offer cylinderheapar:

• quantity: 1
• options: Ship-to-home
• availability: In Stock
• sold: 0
• started: March 13, 2026
• best offers: True

returns cylinderheapar:

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

general cylinderheapar:

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

shipping cylinderheapar:

seller cylinderheapar:

• rating: 100.0%
• city: Tucson, Arizona
• # reviews: 2251

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