AFTERMARKET PRODUCTS 3802339 Cylinder Head Diesel Engine 3.9L 4BTA

( Brand: Aftermarket Products ), ( Manufacturer Part Number: 3802339 ), ( Fitment Type: Direct Replacement ), ( Material: Cast Iron ), ( Years: 94-98 Automotive And Industrial ), ( Type: Cylinder Head Assembly ), ( Ipn: 3.9l/ 4bt ), ( Manufacturer Warranty: 90 Day ), ( Oe/oem Part Number: 3933370 ), ( Country Of Origin: China ), ( Item Weight: 75 Lb Est )

Review AFTERMARKET PRODUCTS Cylinder Head Bare 3.9l 4bt 4b Diesel Engine New fits CUMMINS 1994–1998

The **3802339 Cylinder Head (Bare) for the 3.9L Cummins 4BT/4B/4BTA Diesel Engine** represents a critical, high-performance component designed to deliver exceptional reliability, durability, and efficiency in heavy-duty diesel applications. This precision-engineered part is specifically tailored for the legendary **Cummins 4BT, 4B, and 4BTA inline-six diesel engines**, which have long been celebrated for their robust construction and dependable performance in commercial trucks, buses, and industrial equipment. The cylinder head is crafted from high-grade cast iron or aluminum (depending on the variant), ensuring optimal heat dissipation while maintaining structural integrity under extreme operating conditions. Its design incorporates a **four-valve-per-cylinder architecture**, featuring intake and exhaust valves that are meticulously machined to maximize airflow efficiency, thereby enhancing combustion performance and fuel economy. The head is equipped with **integrated combustion chambers** and **precise valve guides**, which work in tandem with the engine s turbocharging system to optimize power delivery while minimizing emissions. This component is also engineered to accommodate the **common-rail direct-injection fuel system** found in later Cummins 4BT/4B models, ensuring seamless compatibility with modern fueling technologies. Whether installed in a classic **4BT (pre-2003) or a refined 4BTA (post-2003) engine**, this cylinder head plays a pivotal role in sustaining peak torque, reducing carbon buildup, and extending the overall lifespan of the powerplant. For enthusiasts and professionals seeking a **direct replacement or upgrade**, this bare cylinder head offers a cost-effective solution while maintaining the integrity of the engine s original performance characteristics. Proper installation, including the application of high-quality gaskets, torque specifications, and valve adjustments, is essential to unlock its full potential and ensure long-term reliability in demanding applications.

### **Pros and Cons of Buying a 3802339 Cylinder Head (3.9L Cummins 4BT/4B/4BTA Diesel Engine)**

#### **Pros**

1. **Proven Reliability** The 3.9L Cummins engine, particularly the 4BT/4B/4BTA variants, is widely regarded as one of the most durable diesel engines ever produced. The 3802339 cylinder head is a key component in this engine, known for its robust construction and longevity when properly maintained.

2. **High Torque Output** The 3.9L Cummins is famous for its strong low-end torque, making it ideal for heavy-duty applications like trucks, buses, and industrial equipment. The cylinder head plays a critical role in maintaining this performance.

3. **Aftermarket Support** Due to its popularity, the 3.9L Cummins has a vast aftermarket, including readily available parts, upgrades, and tuning solutions. The 3802339 head is no exception, with common modifications like porting, valve jobs, and turbo upgrades available.

4. **Fuel Efficiency** Compared to modern engines, the 3.9L Cummins is known for its fuel efficiency, especially in older models. A well-maintained cylinder head helps sustain this efficiency.

5. **Classic Build Quality** The cast iron construction of the 3802339 head is durable and resistant to warping, which is a common issue in aluminum heads. This makes it a reliable choice for high-mileage applications.

6. **Compatibility with Upgrades** The engine s design allows for various performance enhancements, such as turbocharger swaps, fuel system upgrades, and intake/exhaust modifications. The cylinder head is a key factor in these upgrades.

7. **Resale Value** In the right applications (especially in off-road, classic trucks, or industrial use), a Cummins-powered vehicle retains strong resale value, partly due to the reputation of its components.

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#### **Cons**

1. **Age-Related Wear** The 3.9L Cummins engines (especially older 4BT/4B models) are known for wear issues after high mileage, such as rod bearing wear, camshaft wear, and lifter problems. The cylinder head itself may not be the primary issue, but related components can fail, requiring costly repairs.

2. **Emissions Compliance** Modern emissions regulations (EPA, Euro standards) have made aftermarket modifications more complex. Some cylinder head upgrades or turbo swaps may not comply with current emissions laws, limiting their use in street-legal applications.

3. **High Maintenance Costs** While the engine is durable, the cost of parts and labor for repairs can be significant. The 3802339 head itself is not overly expensive, but associated components (camshafts, lifters, injectors) can add up.

4. **Water Pump and Thermostat Issues** Older Cummins engines (pre-2003) are notorious for water pump and thermostat failures, which can lead to overheating and cylinder head damage if not addressed promptly.

5. **Limited Modern Applications** While still used in some industrial, marine, and off-road applications, the 3.9L Cummins is no longer produced for passenger vehicles. This means finding OEM parts can be difficult, and some aftermarket support has shifted to newer Cummins models (e.g., 6.7L).

6. **Potential for Leaks** Gaskets (head gasket, valve cover gasket) and seals (oil seals, water pump seals) are common failure points in older Cummins engines. A poorly maintained cylinder head assembly can lead to leaks and further damage.

7. **Noise and Vibration** Some owners report increased noise and vibration in high-mileage engines, which may be exacerbated by worn components related to the cylinder head (e.g., valve train issues).

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### **Conclusion**

The **3802339 cylinder head** for the 3.9L Cummins engine is a high-quality, durable component that remains a favorite in performance and industrial applications. Its cast iron construction, reliability, and compatibility with aftermarket upgrades make it a strong choice for enthusiasts and professionals who prioritize longevity and torque. However, potential buyers should be aware of the engine s age-related weaknesses, high maintenance costs, and emissions compliance challenges.

If you are restoring a classic Cummins-powered vehicle, using an aftermarket or OEM 3802339 head can be a solid investment. For industrial or off-road use, where emissions restrictions are less of a concern, this engine remains a dependable powerplant. However, for street-legal applications or those seeking modern convenience, newer Cummins or diesel engines may be more practical.

### **Recommendation**

- **Buy if:** You are restoring a classic Cummins truck, building an off-road or industrial vehicle, or prioritize torque and durability over modern emissions compliance. Ensure the rest of the engine (camshaft, lifters, injectors) is in good condition.

- **Avoid if:** You need a low-maintenance, emissions-compliant engine for daily driving or are unwilling to invest in potential future repairs. Consider a newer Cummins (e.g., 6.7L) or diesel engine if emissions and modern features are priorities.

- **Best Practices:** If purchasing a used 3802339 head, inspect it for cracks, warping, or signs of overheating. Ensure the engine block and related components (water pump, thermostat, gaskets) are in good condition to prevent future issues. Regular maintenance (oil changes, coolant flushes) is essential for longevity.

Details:

Information: fits 4BT APPLICATIONS WITH 7MM INJECTOR HOLES. This is a NEW Aftermarket 3.9L DIESEL 8 Valve 4BT Cummins Diesel BARE Cylinder Head. Discount prices on quality New Reconditioned Automotive Replacement Part.

part #: 3802339 price

• $536.00

specifications cylinderheapar:

• for models: Cummins
• for years: 1994-1998
• brand: Aftermarket Products
• mpn: 3802339
• fitment type: Direct Replacement
• material: Cast Iron
• years: 94-98 Automotive And Industrial
• type: Cylinder Head Assembly
• ipn: 3.9l/ 4bt
• manufacturer warranty: 90 Day
• oe/oem part number: 3933370
• country of origin: China
• item weight: 75 Lb Est

general cylinderheapar:

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

seller cylinderheapar:

• # reviews: 17642
• rating: 99.5%
• city: Dallas, Texas

payments cylinderheapar:

• other
• wallet: Google-pay
• credit card: Diners-club

offer cylinderheapar:

• options: Ship-to-home
• sold: 0
• started: February 10, 2026
• quantity: 1
• availability: In Stock

returns cylinderheapar:

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

shipping cylinderheapar:

• service: UPS Ground
• type: Fixed
• carrier: UPS
• cost: $0.00
• class: Standard
• transit: 3-8 Days

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