SUBARU 13052AA670 Engine Motor Left Driver Cylinder Head 3.6

( Manufacturer Part Number: 13052AA670 ), ( Interchange: 306-50458 ), ( Type: Cylinder Head ), ( Year: 18 ), ( Id: D02adc94-8a45-448a-b905-596c4343a705 ), ( Country Of Origin: Japan )

Review SUBARU 3.6 Engine Motor Left Driver Side Cylinder Head fits LEGACY 2010–2019

The **Subaru 13052AA670 cylinder head (Left Driver Side, 2010 2019 3.6L FB25 Engine)** is a precision-engineered component designed to deliver optimal performance, reliability, and durability for the iconic FA and FB platform Subaru vehicles. Crafted from high-grade cast aluminum alloy, this cylinder head is meticulously machined to accommodate the FB25 s advanced **Horizontally-Opposed (Flat-4) architecture**, featuring dual overhead camshafts (DOHC) and four valves per cylinder for efficient airflow and power delivery. The left driver-side head is specifically engineered to integrate seamlessly with the engine s intake and exhaust manifolds, ensuring proper alignment with the **20-valve configuration** and the **variable valve timing (VVT) system**, which enhances throttle response and fuel efficiency across the engine s operational range. Its robust construction includes reinforced valve seats, precision-bored combustion chambers, and integrated spark plug bosses, all of which contribute to consistent combustion and reduced wear over extended mileage. This cylinder head is compatible with Subaru s **3.6L FB25 engines**, found in models such as the **Outback, Legacy, Forester, Tribeca, and Crosstrek (pre-2019)**, making it a critical replacement part for engines requiring maintenance, upgrades, or performance enhancements. Whether addressing issues like **leaking head gaskets, warped surfaces, or valve train wear**, or as part of a **restoration or high-performance rebuild**, this OEM-quality cylinder head ensures the engine operates at peak efficiency while maintaining Subaru s reputation for rugged reliability. Its compatibility with modern fuel injection systems and emissions controls further underscores its importance in maintaining compliance and performance standards for both stock and modified applications.

### **Pros and Cons of Buying a Used Subaru 3.6L (FB25) Cylinder Head (Left Driver Side, 2010-2019 Models)**

1. **Common and Widely Available** The Subaru FB25 3.6L engine is one of the most popular in its class, meaning parts, labor, and aftermarket support are abundant. Finding a replacement cylinder head or related components is relatively easy.

2. **Proven Reliability (When Maintained)** When properly serviced, the FB25 is known for durability, especially in cooler climates. Many owners report long-term reliability if oil changes and cooling system maintenance are consistent.

3. **Aftermarket Support** There are numerous aftermarket cylinder heads, gaskets, and performance upgrades available, including high-flow options for improved airflow and cooling.

4. **Potential for Performance Tuning** The 3.6L engine responds well to tuning, allowing for increased power output if the rest of the engine is in good condition. Head swaps (e.g., to a high-flow or forged head) can be done for better performance.

5. **Lower Cost Than Rebuilding** Purchasing a used cylinder head (if inspected and tested) can be significantly cheaper than a full engine rebuild, especially if the rest of the engine is in good shape.

6. **Compatibility with Other FB25 Engines** The left driver-side cylinder head is identical to the right passenger-side head, meaning you can use it in any FB25 application without modification.

7. **Potential for Long-Term Use** If sourced from a well-maintained vehicle with no signs of internal damage (warping, cracks, or excessive wear), a used cylinder head can last for many more years.

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- **Warping** (common due to overheating or poor cooling).

- **Internal cracks** (especially around the valve guides or spark plug holes).

- **Exhaust port erosion** (from poor fuel quality or detonation).

- **Valve seat wear** (leading to oil consumption or misfires).

- **Rodent or corrosion damage** (if stored improperly).

2. **No Warranty or Guarantee** Unlike buying from a dealer or a trusted mechanic, a private sale means no return policy or warranty. If the head fails shortly after installation, you re responsible for the cost.

3. **Potential for Mismatched Parts** If the head was removed from a vehicle with high mileage, it may have worn components (e.g., valve guides, seats, or lifters) that require additional replacement, increasing costs.

- Proper gasket sealing (using high-quality gaskets and sealant).

- Correct torque specifications (over-torquing can warp the head).

- Valve lash adjustment (if using mechanical lifters).

- Coolant system bleeding to avoid air pockets.

- A compression test post-installation to ensure proper sealing.

5. **Risk of Contamination** If the head was stored improperly, it may have debris (metal shavings, dirt, or old gasket material) inside, which could cause damage during installation.

6. **Potential for Cooling System Issues** The FB25 is prone to overheating if the cooling system is neglected. A used head may come from a vehicle with a failing water pump, thermostat, or radiator, which could lead to premature failure.

7. **No Inspection History** Without access to the vehicle s maintenance records, you won t know if the head was properly serviced (e.g., valve adjustments, head gasket replacement) before removal.

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### **Key Considerations Before Purchase**

- Visually inspect the head for cracks, warping, or corrosion.

- Check for proper valve seat condition (should be smooth, not eroded).

- Test for compression leaks (spraying carb cleaner around valves while cranking).

- Verify that the deck surface is flat (warping can cause head gasket failure).

2. **Source from a Trusted Seller**

- **Dealers or junkyards** (often have some inspection done).

- **Mechanics or rebuilders** (may offer a limited warranty).

- **Avoid eBay or Craigslist without inspection** unless you re prepared to risk damage.

3. **Budget for Additional Repairs**

- Valve seats ($100 $300).

- Valve guides ($200 $500).

- Lifters or camshaft ($300 $800).

- Head gasket ($50 $150).

- Labor costs for installation can range from **$800 $1,500 **, depending on complexity.

4. **Alternative Options**

- **Rebuilt Head** Some shops offer rebuilt heads with warranties (more expensive but safer).

- **New Head** If budget allows, a new cylinder head ( $1,200 $1,800) eliminates risk but is costly.

- **Full Engine Swap** If the engine is beyond repair, a used FB25 engine ( $2,000 $4,000) may be more cost-effective than head-only replacement.

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### **Final Recommendation**

You **inspect it thoroughly** (or have a mechanic verify its condition).

You **source it from a reputable seller** (dealer, junkyard, or trusted mechanic).

You **budget for potential additional repairs** (valve seats, guides, or gaskets).

You **are prepared for installation challenges** (proper gasket sealing, torque specs, and post-install testing).

**Avoid buying blindly** Many used heads fail prematurely due to hidden damage, leading to wasted money and engine issues. If unsure, consider a **rebuilt head or new part** for long-term reliability.

- If the head is **visually sound, flat, and has no cracks**, and you re confident in installation, a used head can be a **cost-effective solution**.

- If the head shows **any signs of wear, warping, or erosion**, it s **not worth the risk** unless you re prepared for extra repairs.

- For **peace of mind**, a **rebuilt head from a trusted shop** is the safest option, even if more expensive.

A used Subaru FB25 cylinder head can be a **good deal if properly inspected and sourced**, but it carries **significant risk if bought without due diligence**. Always prioritize **condition over price** a slightly more expensive but reliable part is better than a cheap one that fails quickly.

Details:

If listing states free shipping, shipping is within the 48 only. Redeliver, limited access fees. Over 600,000 parts on inventory. This item is from a 18 SUBARU LEGACY.

Over 6,000 vehicles in the yard and more arriving daily. Cylinder Head. Also, any tests that can possibly be done prior to installation should completed at time. Local delivery available to local businesses only.

Model: SUBARU LEGACY.

part #: 13052aa670 prices

• $83.60-$356.00

specifications cylinderheapar:

• for models: Legacy
• for makes: Subaru
• for years: 2010-2019
• mpn: 13052aa670
• interchange: 306-50458
• type: Cylinder Head
• year: 18
• id: D02adc94-8a45-448a-b905-596c4343a705
• country of origin: Japan

payments cylinderheapar:

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

general cylinderheapar:

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

offer cylinderheapar:

• quantity: 1
• availability: In Stock
• options: Ship-to-home
• sold: 0
• started: February 13, 2026

seller cylinderheapar:

• city: Cochranton, Pennsylvania
• # reviews: 31171
• rating: 99.9%

shipping cylinderheapar:

• transit: 5-8 Days
• type: Fixed
• cost: $109.99
• class: Standard
• service: Standard

returns cylinderheapar:

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

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