CHEVROLET 0239906 Cylinder Head Vortec 5.7 L31

( Brand: Chevrolet ), ( Manufacturer Part Number: 0239906 ), ( Type: Cylinder Head ), ( Material: Cast Iron ), ( Vintage Part: No )

Review CHEVROLET Chevy 5.7 Ohv Cylinder Head Pair 906 Sbc L31 Vortec fits 350 1996–2002

The **Chevrolet 0239906 Cylinder Head Assembly** is a high-performance, precision-engineered component designed exclusively for the **L31 350 Vortec** V8 engine, found in select **1996 2002 Chevrolet trucks, SUVs, and performance-oriented vehicles** such as the Silverado, Tahoe, Suburban, and GMC Sierra. This **cast aluminum cylinder head** is engineered to deliver exceptional durability, thermal efficiency, and power output, making it a critical upgrade for enthusiasts seeking enhanced reliability and performance in their high-mileage or heavily modified engines. The **906-series head** features a **hydraulic valve lifter system** paired with **solid valve springs**, ensuring smooth operation and minimizing wear over extended use, while its **integrated combustion chamber design** optimizes fuel-air mixture for improved combustion efficiency and reduced emissions. The **pushrod-actuated overhead valve (OHV) architecture** incorporates **1.94-inch intake valves** and **1.60-inch exhaust valves**, allowing for better airflow dynamics and increased horsepower potential when paired with a high-flow intake manifold and performance camshaft. This cylinder head is compatible with **L31 350 Vortec engines** equipped with **LS1-style valve covers** and **Vortec-style rocker arms**, making it a seamless fit for both stock and modified applications. Whether used in a **restoration project, high-mileage rebuild, or performance build**, this head ensures a robust foundation for reliable operation and improved engine performance, making it an essential component for maintaining the integrity and efficiency of the **350 Vortec V8** in classic and modern applications alike.

### **Pros and Cons of Buying a 1996 2002 Chevrolet 5.7L (L31) Vortec 350 Cylinder Head (Part #0239906)**

1. **Compatibility** The **0239906** cylinder head is designed specifically for the **L31 5.7L Vortec** engine, which powers many **1996 2002 Chevrolet trucks, SUVs, and some GMCs**. This ensures a proper fit with stock dimensions and bolt patterns.

2. **Performance Potential** The L31 Vortec 350 is a **highly tunable engine**, capable of handling **forced induction (turbo/supercharger), nitrous, and high RPM modifications** with the right supporting parts. A fresh cylinder head can improve airflow, cooling, and durability.

3. **Durability & Reliability** When properly maintained, the **Vortec 350 is known for longevity**, especially with **high-quality internals, a good head gasket, and proper valve adjustment**. Many of these engines last **200,000 miles** with basic upkeep.

4. **Aftermarket Support** The L31 has a **strong aftermarket presence**, meaning you ll find **easy access to parts, performance upgrades, and tuning solutions** (e.g., **cams, springs, intake manifolds, and fuel system upgrades**).

5. **Cost-Effective Upgrade** Replacing a **worn or leaking cylinder head** is often **cheaper than a full engine swap**, especially if the rest of the engine is in good condition. A new head can **restore compression, prevent overheating, and improve power output**.

6. **Common Issues Are Well-Documented** Problems like **head gasket leaks, warped heads, or valve train wear** are widely understood, making diagnostics and repairs more straightforward.

7. **Good for DIYers** The **L31 is relatively straightforward to work on**, with **common tools and procedures** for head removal, machining, and installation.

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1. **Potential for Hidden Damage** If the engine has a **history of overheating, hard use, or poor maintenance**, the cylinder head (or block) may have **warping, cracks, or internal damage** that isn t immediately visible. Always **inspect for leaks, compression, and block warpage** before purchasing.

2. **Head Gasket Failures Are Common** The **L31 is prone to head gasket leaks**, especially if the engine was **overheated or modified improperly**. A new head alone won t fix this **block condition must also be checked**.

3. **Valvetrain Wear Over Time** Older L31 engines may suffer from **worn valve guides, seats, or springs**, leading to **oil consumption, valve float, or pre-ignition**. A **valve job or full rebuild** may be needed alongside the head replacement.

4. **Fuel System Limitations** The stock **L31 runs on 87 89 octane fuel**, which can lead to **detonation under heavy loads** (especially with forced induction). Upgrading to **higher-octane fuel or a fuel system tune** is often necessary for serious modifications.

5. **Timing Chain & Water Pump Issues** The **L31 uses a timing chain**, which can stretch or break over time, leading to **valve damage**. The **water pump is also chain-driven**, so if it fails, it can cause **engine damage**. Replacing the **timing chain kit** is recommended during a head job.

6. **Emissions & Modern Compliance** Some **1996 2002 trucks** have **OBD-I or early OBD-II systems**, which may require **tuning or modifications** if you plan to **remove or modify emissions components** (e.g., EGR, PCV, or catalytic converters).

7. **Finding a Reputable Supplier** Since the **0239906 is an OEM part**, you must ensure it s **genuine Chevrolet** (not a knockoff). Purchasing from a **trusted dealer, junkyard, or reputable online seller** (e.g., **RockAuto, eBay verified, or local salvage yards**) is crucial to avoid counterfeit parts.

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### **Conclusion & Recommendation**

**You have a reliable L31 engine** (no major block or rod damage).

**The head is leaking, warped, or has cracked passages** (confirmed via inspection).

**You plan to modify the engine** (turbo, supercharger, nitrous) and need a **fresh, high-quality head**.

**You re doing a full rebuild or major overhaul** and want to **prevent future head-related failures**.

**You have access to proper tools and mechanical knowledge** (or a trusted mechanic).

**The engine has a history of severe overheating** (check for **warped blocks, cracked heads, or rod damage**).

**You re buying a used head without verifying its condition** (warping, cracks, or leaks can ruin a rebuild).

**You don t plan to address supporting issues** (timing chain, water pump, fuel system, or valvetrain).

**You re purchasing from an untrusted source** (risk of **counterfeit or damaged parts**).

---

If you re **replacing a faulty cylinder head** in a **well-maintained L31 engine**, the **0239906 is a solid OEM choice** that will **improve performance, reliability, and longevity**. However, **always inspect the block, gaskets, and valvetrain** before installation to avoid **costly mistakes**.

- **Machining the head** (if warped) before installation.

- **Replacing the head gasket** (preferably with a **high-quality aftermarket gasket** like **Fel-Pro or Fel-Pro ProSeal**).

- **Upgrading the valvetrain** (if the engine is high-mileage).

- **Ensuring proper cooling** (radiator, thermostat, and coolant system in good condition).

If you re **building a high-performance L31**, pairing this head with **aftermarket upgrades (cams, springs, intake, fuel system)** will maximize gains. For **daily driving**, a **fresh head proper maintenance** will keep the engine running strong for **many more years**.

**Verdict:** *Worth it if the engine is sound and the head is the issue. Avoid if the rest of the engine is neglected.*

Details:

Price is for a matching pair. Engine Fitment: 1996 - 2002 Chevy/GMC 5.7L. Chamber Size: 64cc. Valve Sizes: 1.94 Intake / 1.50 Exhaust.

Are the actual product.

part #: 0239906 prices

• $110.00-$846.99

specifications cylinderheapar:

• for models: 350
• for makes: Chevy, Chevrolet
• for years: 1996-2002
• brand: Chevrolet
• mpn: 0239906
• type: Cylinder Head
• material: Cast Iron
• vintage part: No

offer cylinderheapar:

• options: Ship-to-home
• sold: 0
• started: March 18, 2026
• quantity: 1
• availability: In Stock

returns cylinderheapar:

• policy: No Returns

shipping cylinderheapar:

• type: Calculated
• class: Standard
• cost: $116.27
• service: FedEx Ground / FedEx Home Delivery
• transit: 3-8 Days
• carrier: FedEx

seller cylinderheapar:

• # reviews: 31
• city: Greenville, South Carolina
• rating: 100.0%

general cylinderheapar:

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

payments cylinderheapar:

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

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