AC DELCO 55681CSTQ Engine Cylinder Head

( Brand: Ac Delco ), ( Manufacturer Part Number: 55681CSTQ ), ( Part Type: Engine Cylinder Head ), ( Manufacturer Warranty: 12 Month Warranty ), ( Notes: Engine Cylinder Head Assembly New; Without Cam Shafts And H. ), ( Application: Chevrolet Cruze Limited Engine Cylinder Head Assembly ), ( Product Name 2: Cylinder Head ), ( Cs-sku: 400 )

Review AC DELCO Chevrolet Limited Engine Cylinder Head Assembly fits CRUZE 2016

The **AC Delco 55681CSTQ** is a high-performance, direct-replacement **cylinder head** specifically engineered for the **Chevrolet Cruze** engine family, featuring the **1.8L or 2.0L inline-four (LXV or LXW) powerplant** with **intercooler turbocharging**. This meticulously crafted component represents the pinnacle of aftermarket engineering, designed to restore or enhance the efficiency, reliability, and power output of your Cruze s turbocharged engine. Constructed from **high-grade cast iron**, the cylinder head is precision-machined to exacting specifications, ensuring optimal sealing, cooling, and combustion performance. Its **integrated exhaust manifold design** simplifies installation by eliminating the need for additional gaskets or adapters, while the **reinforced valve seats and hardened valve guides** provide superior durability against the high temperatures and pressures generated by turbocharged operation. The head incorporates **modern porting and combustion chamber geometry**, optimized for improved airflow and better fuel atomization, which can contribute to a noticeable increase in horsepower and torque while maintaining smooth operation. For added longevity, the **intake and exhaust ports** are designed to minimize carbon buildup, reducing the risk of performance degradation over time. Whether replacing a worn or damaged original part or upgrading for enhanced performance, the **AC Delco 55681CSTQ** delivers a robust, factory-matched solution that meets or exceeds OEM standards, ensuring a seamless fit and reliable performance in your Chevrolet Cruze s turbocharged engine.

The **AC Delco 55681CSTQ** is a popular aftermarket replacement for the **Chevrolet Cruze s 1.8L or 2.0L engine s cylinder head**, particularly for the **LXV or LXZ engines**. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the AC Delco 55681CSTQ Cylinder Head**

1. **High-Quality Materials and Construction**

- AC Delco is a trusted brand under General Motors, known for using durable materials like **cast iron or aluminum** (depending on the engine variant) that match or exceed OEM standards.

- The head is designed to withstand high temperatures and pressures, reducing the risk of warping or cracking over time.

2. **OEM Compatibility**

- The part is **directly interchangeable** with the original Chevrolet cylinder head, ensuring a perfect fit without modifications.

- It includes all necessary **gaskets, bolts, and hardware** required for installation, simplifying the replacement process.

3. **Reliability and Durability**

- Many drivers report that AC Delco parts last as long as or longer than OEM components, especially when properly installed and maintained.

- The head is built to handle the **1.8L or 2.0L Cruze engine s** power output without excessive wear, provided the engine is not subjected to extreme modifications.

4. **Warranty Coverage**

- AC Delco typically offers a **limited warranty** (often 12 24 months), which provides peace of mind against defects in materials or workmanship.

5. **Cost-Effective Alternative to OEM**

- While not always the cheapest option, it is **significantly more affordable than purchasing a used or remanufactured OEM head**, making it a practical choice for budget-conscious buyers.

6. **Ease of Installation**

- The part comes with **clear instructions**, and since it is a direct replacement, mechanics (or DIYers) familiar with cylinder head swaps can install it relatively quickly.

7. **Performance Consistency**

- Unlike some aftermarket parts that may vary in quality, AC Delco maintains consistent performance metrics, ensuring reliable cooling and combustion efficiency.

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### **Cons of the AC Delco 55681CSTQ Cylinder Head**

1. **Potential for Lower Quality Than OEM in Some Cases**

- While generally reliable, **aftermarket parts can sometimes have slight variations in machining tolerances** compared to the original GM part.

- In rare instances, the **valve seats or guides** may not be as precisely fitted, leading to minor issues like **leaking valves** or **premature wear** if the engine is heavily modified.

2. **Limited Availability of Specific Variants**

- The **55681CSTQ** is designed for **specific Cruze engine variants** (LXV/LXZ). If the wrong part is ordered (e.g., confusing it with a different engine s head), it may not fit.

- Some online sellers may mislabel parts, so **double-checking the engine code** is crucial before purchase.

3. **No Upgrades Over OEM**

- Unlike some aftermarket heads designed for **performance tuning**, the AC Delco part is a **direct replacement** and does not offer improvements like **larger valves, better cooling, or high-flow characteristics**.

- If the goal is **increased horsepower**, a specialized aftermarket head (e.g., from **JE, Scat, or Crane**) may be necessary.

4. **Installation Challenges for DIYers**

- While not overly complex, **cylinder head replacement requires precision** in sealing, gasket application, and torque specifications.

- Improper installation (e.g., **over-torquing bolts, incorrect gasket placement**) can lead to **leaks, warping, or even engine damage**.

5. **Mixed Reviews on Longevity in Aggressive Driving Conditions**

- Some users report that the head holds up well under **normal driving conditions**, but those who **push the engine hard (e.g., frequent high RPM, track use, or forced induction)** may experience **sooner-than-expected wear** compared to OEM parts.

6. **Potential for Counterfeit Parts**

- Since AC Delco is a well-known brand, **counterfeit or knockoff parts** sometimes enter the market, especially on platforms like eBay or Amazon.

- Buying from **authorized dealers, RockAuto, or reputable mechanics** reduces this risk.

7. **No Included Valve Adjustment Tools**

- Unlike some OEM heads, the AC Delco part does **not come with valve adjustment tools**, which may require an additional purchase if the engine requires valve lash checks.

---

### **Conclusion**

The **AC Delco 55681CSTQ cylinder head** is a **solid, reliable replacement** for the Chevrolet Cruze s 1.8L or 2.0L engine, offering **OEM-level compatibility, durability, and ease of installation**. It is an excellent choice for **routine maintenance, leaks, or minor engine issues** where a direct replacement is needed without performance upgrades.

However, it is **not ideal** for those seeking **high-performance modifications** or extreme engine tuning, as it lacks the specialized features of aftermarket racing heads. Additionally, **proper installation is critical** poor sealing or torque application can negate its benefits and even cause damage.

For **most everyday drivers**, the AC Delco part is a **cost-effective, trustworthy option** that balances **quality and affordability**. If budget is a concern, it is a **better alternative to a used OEM head**, while still maintaining reliability.

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### **Recommendation**

- **Buy from a trusted source** (e.g., **RockAuto, Summit Racing, or an authorized GM parts dealer**) to avoid counterfeit parts.

- **Verify the exact engine variant** (LXV/LXZ) before purchasing to ensure compatibility.

- **Follow proper installation procedures**, including **correct gasket application, torque specifications, and valve adjustment** if needed.

- **Consider a remanufactured OEM head** if the engine has **high mileage or severe wear**, as remanufactured parts may offer **longer lifespan and better machining**.

- **Avoid using this part for forced induction or extreme modifications** opt for a **performance cylinder head** (e.g., **JE 4150, Scat 4150**) if tuning is the goal.

**Final Verdict:** The **AC Delco 55681CSTQ is a dependable choice** for standard Cruze cylinder head replacements, offering a **good balance of cost, quality, and reliability** for most applications.

Details:

GM regularly updates production and service part designs to integrate new materials technologies. Some GM Genuine Parts may have formerly appeared as AcDelco Original Equipment OE. Parts Geek - For Chevrolet Cruze Limited Engine Cylinder Head Assembly AC Delco 55681CSTQ: Review Fitment Notes to Ensure Proper Fit condition: Remanufactured Brand: Notes: New; Without CAM SHAFTS AND HYDRAULIC LASH ADJUSTERS Features: GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle.

part #: 55681cstq prices

• $51.95-$861.08

specifications cylinderheapar:

• for models: Cruze
• for makes: Chevrolet
• for years: 2016
• brand: Ac Delco
• mpn: 55681cstq
• part type: Engine Cylinder Head
• manufacturer warranty: 12 Month Warranty
• notes: Engine Cylinder Head Assembly New; Without Cam Shafts And H.
• application: Chevrolet Cruze Limited Engine Cylinder Head Assembly
• product name 2: Cylinder Head
• cs-sku: 400

offer cylinderheapar:

• quantity: 1
• options: Ship-to-home
• sold: 0
• availability: In Stock
• started: April 21, 2026

general cylinderheapar:

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

shipping cylinderheapar:

• transit: 3-7 Days
• type: Fixed
• service: FedEx Ground / FedEx Home Delivery
• carrier: FedEx
• cost: $0.00
• class: Standard

returns cylinderheapar:

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

payments cylinderheapar:

• credit card: Visa
• other
• wallet: Paypal

seller cylinderheapar:

• rating: 98.8%
• # reviews: 329509
• city: Fresno, California

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