CHRYSLER AS7U3 Cylinder Head Engines Cam 287 2.2/2.5

( Manufacturer Part Number: AS7U3 ), ( Type: Cylinder Head ), ( Manufacturer Warranty: 1 Year ), ( Material: Aluminum ), ( Vintage Part: Yes ), ( Finish: Unfinished ), ( Country Of Origin: United States ), ( Item Weight: 45 ), ( Performance Part: No )

Review CHRYSLER 287 Cylinder Head 2.2/2.5 Engines Cam Remanufactured fits 1982–1995

The **Chrysler AS7U3 287-degree cylinder head** is a meticulously engineered component designed specifically for the **2.2L and 2.5L inline-four engines** produced by Chrysler from **1982 through 1995**, including applications in vehicles like the Dodge Colt, Plymouth Arrow, Chrysler Horizon, and various commercial and light-duty truck models. This cylinder head is a critical part of the engine s combustion system, featuring a **287-degree valve angle** a design choice that balances airflow efficiency, compactness, and reliability while accommodating the engine s moderate displacement and performance requirements. Crafted from high-quality cast iron, the head is precision-machined to ensure tight tolerances, with **four valves per cylinder** (two intake and two exhaust) arranged in a compact, efficient layout that maximizes cylinder packing density without sacrificing durability. The **intake ports** are generously sized to promote smooth airflow, while the **exhaust ports** are optimized for efficient scavenging, reducing backpressure and improving exhaust gas expulsion. The head incorporates **pushrod-operated overhead valves**, driven by a single camshaft located in the valley between the cylinders, a design that simplifies maintenance while delivering reliable performance. Key features include **integrated spark plug bosses** for precise ignition placement, **valve guides and seats** machined for longevity, and **cast-in cooling passages** to dissipate heat effectively, preventing thermal stress and ensuring consistent performance under varying operating conditions. Whether used in stock applications, light modifications, or as a foundation for more aggressive builds, this cylinder head is a robust and dependable component that has stood the test of time, offering a balance of strength, efficiency, and ease of serviceability. For enthusiasts and mechanics working on these classic Chrysler engines, sourcing a genuine or high-quality aftermarket AS7U3 head ensures compatibility with factory specifications while providing a solid platform for further tuning or restoration.

The Chrysler AS7U3 287 cylinder head, used in the 2.2L and 2.5L engines from 1982 to 1995, is a popular choice among enthusiasts for its simplicity, reliability, and potential for high performance. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the AS7U3 287 Cylinder Head**

1. **Proven Reliability and Durability**

The AS7U3 head is a robust design that has stood the test of time, especially in the 2.5L applications (common in Dodge Omni, Plymouth Horizon, and early Chrysler K-cars). When properly maintained, these heads can last well over 200,000 miles. The cast iron construction resists warping better than some aluminum heads, making them less prone to catastrophic failure from overheating or poor maintenance.

2. **Simplicity and Accessibility**

The design is straightforward, with minimal internal complexity compared to modern heads. This makes repairs, modifications, and maintenance easier for DIYers. Parts like valves, springs, and retainers are widely available and relatively inexpensive. The head also features a single-valve-per-cylinder design (OHV), which is simpler than modern overhead cam (OHC) or dual-overhead cam (DOHC) setups.

3. **High Performance Potential**

With the right modifications, the AS7U3 can produce impressive power for its displacement. Porting and polishing the combustion chambers can significantly improve airflow, while larger valves (up to 1.97" intake and 1.56" exhaust) can increase horsepower and torque. The head responds well to forced induction (turbocharging or supercharging), making it a favorite in street and drag applications. Many builds achieve 300 horsepower with stock bottom ends and minimal reinforcement.

4. **Cost-Effective Upgrades**

Unlike some modern heads, the AS7U3 benefits from affordable aftermarket parts. Companies like **JE**, **Crane**, **Comp Cams**, and **Eagle** offer high-quality valves, springs, and rocker arms that can be installed without extensive machining. The head s simplicity also means that porting can be done by hand with basic tools, reducing labor costs.

5. **Compatibility with Modern Engines**

The AS7U3 head can be paired with modern components, such as high-flow fuel injectors, performance carburetors (like Holley or Edelbrock), or electronic fuel injection (EFI) systems. This makes it versatile for both classic and modern builds. Some builders even combine these heads with larger displacements (e.g., 2.8L or 3.0L) for even more power.

6. **Strong Community and Support**

The Chrysler 2.2L/2.5L community is active, with forums (e.g., **Chrysler25**, **HorizonOmni.com**) and YouTube channels dedicated to builds, modifications, and troubleshooting. This means you ll find plenty of resources for advice, parts sourcing, and inspiration.

7. **Minimal Warping Issues**

Cast iron heads are less susceptible to warping than aluminum heads, which can be a major issue with improper cooling or overheating. This makes the AS7U3 a more forgiving choice for those who may not have perfect cooling setups.

8. **Easy to Modify for High RPM**

The head s design allows for aggressive camshaft profiles and high-lift rocker arms, making it suitable for high-RPM applications like drag racing or street tuning. Many builds push these engines to 7,000 RPM without issues, provided the bottom end is reinforced.

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### **Cons of the AS7U3 287 Cylinder Head**

1. **Limited Stock Performance**

Stock AS7U3 heads are not designed for high performance. The stock valves (1.50" intake, 1.25" exhaust) and small combustion chambers restrict airflow, limiting power output. Without modifications, these engines are underpowered compared to modern standards. Even with a stock head, expect around **80-100 horsepower** in the 2.2L and **100-120 horsepower** in the 2.5L, which is modest for a modern engine.

2. **Weak Valve Springs and Retainers**

The stock valve springs and retainers are not designed for high-performance applications. They can become sluggish or even fail under heavy acceleration or forced induction. Upgrading to **Comp Cams or JE springs** is essential for any serious modification.

3. **Potential for Leaking Head Gaskets**

While not as prone to warping as aluminum heads, cast iron heads can still develop leaks at the gasket surface, especially if the block or head is warped from overheating. Proper torque specs and gasket material (e.g., **Fel-Pro or ARP gaskets**) are critical to prevent leaks.

4. **Limited Aftermarket Support for High-End Mods**

While basic parts are widely available, high-end modifications (e.g., **nitrous oxide kits, extreme forced induction, or nitrous-ready builds**) require more specialized components. Some aftermarket parts may not be as refined as those for more modern engines, leading to potential compatibility issues.

5. **Valvetrain Wear Over Time**

The stock valvetrain (pushrods, rocker arms, and lifters) can wear out, especially in high-mileage engines. Replacing these components is a common maintenance task, and neglecting them can lead to valve float or excessive lash, reducing performance and reliability.

6. **Fuel System Limitations**

The stock fuel system (carburetor or early EFI) is not adequate for high-performance builds. Upgrading to a **high-flow carburetor (e.g., Holley 4150), multi-port fuel injection, or direct injection** is necessary to support increased power. This adds complexity and cost to the build.

7. **Transmission and Drivetrain Strain**

The stock 2.2L/2.5L engines are not designed for high torque. Without reinforcement (e.g., **heavy-duty flywheel, clutch, or transmission**), the valvetrain and drivetrain components can fail under heavy loads. This is especially true for forced induction builds.

8. **Emissions and Modern Compliance**

If you plan to run the engine on the street, you may need to address emissions concerns, especially if the vehicle is not a classic. Modern catalytic converters and OBD-II systems may not be compatible with stock or heavily modified engines, requiring aftermarket solutions (e.g., **catalytic converters, tuners, or emissions hacks**).

9. **Limited Displacement Options**

While the AS7U3 head can be paired with larger displacements (e.g., 2.8L or 3.0L), these builds require additional reinforcement (e.g., **stiffer crankshaft, connecting rods, or pistons**) to handle the increased stress. This adds cost and complexity.

10. **Resale Value and Practicality**

While the AS7U3 head is great for enthusiasts, it may not be the most practical choice for daily driving, especially in modern vehicles. The power output is modest compared to contemporary engines, and the build may not justify the cost of maintenance or modifications for casual use.

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### **Conclusion**

The Chrysler AS7U3 287 cylinder head is a **fantastic choice for enthusiasts** who prioritize simplicity, reliability, and high-performance potential. Its cast iron construction, straightforward design, and strong community support make it ideal for DIY builds, street tuning, and even drag racing. With the right modifications such as porting, upgraded valvetrain components, and a stronger fuel system these heads can produce impressive power while remaining affordable and maintainable.

However, the AS7U3 is **not without limitations**. Stock performance is modest, and serious modifications require additional investment in parts and labor. The valvetrain and fuel system are not built for high-output applications, and modern compliance (emissions, OBD-II) can add complexity. If your goal is **high horsepower, daily drivability, or modern reliability**, you may need to pair this head with more contemporary components or consider other engine options.

For **budget-conscious builders, classic car restorations, or high-performance street/drag applications**, the AS7U3 is an excellent and rewarding choice. It offers a **great balance of cost, modifiability, and potential**, making it one of the most popular heads in its class.

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### **Recommendation**

- **Port and polish** the combustion chambers for better airflow.

- **Upgrade valves** (1.97" intake, 1.56" exhaust) and **valvetrain components** (Comp Cams or JE springs, heavy-duty rocker arms).

- **Reinforce the bottom end** with a **stiffer crankshaft, connecting rods, and pistons** if pushing for high RPM or forced induction.

- **Upgrade the fuel system** to a **high-flow carburetor or multi-port EFI** (e.g., **Holley, Edelbrock, or standalone EFI like Haltech or Link**).

- **Install a high-flow exhaust system** to reduce backpressure and improve scavenging.

- **Consider forced induction** (tur

Details:

No core required. Remanufactured head with a cam. Done by Marshall Engines. Free shipping USA.

Head is complete and ready to go.

part #: as7u3 prices

• $468.00-$1222.77

specifications cylinderheapar:

• for makes: Chrysler
• for years: 1982-1995
• mpn: As7u3
• type: Cylinder Head
• manufacturer warranty: 1 Year
• material: Aluminum
• vintage part: Yes
• finish: Unfinished
• country of origin: United States
• item weight: 45
• performance part: No

payments cylinderheapar:

• credit card: Mastercard
• other
• wallet: Apple-pay
• money order

general cylinderheapar:

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

offer cylinderheapar:

• sold: 0
• availability: In Stock
• options: Ship-to-home
• quantity: 1
• started: February 20, 2026

seller cylinderheapar:

• # reviews: 3188
• rating: 99.9%
• city: Garden City, Kansas

shipping cylinderheapar:

• class: Standard
• type: Calculated
• service: USPS Ground Advantage
• carrier: USPS
• transit: 5-11 Days
• cost: $0.00

returns cylinderheapar:

• policy: No Returns

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