FORD E43E-AJ5 Cylinder Head Ford/mercury 2.3L/140 L4 8V

( Brand: Ford ), ( Manufacturer Part Number: E43E-AJ5 ), ( Type: Cylinder Head ), ( Items Included: Head ), ( Material: Cast Iron ), ( Vintage Part: No ), ( Country Of Origin: United States )

Review FORD Reconditioned Cylinder Head Ford/mercury 2.3l/140 Cid L4 8v Ohv fits 1984–1987

The **Ford E43E AJ5 Cylinder Head** is a meticulously engineered component designed specifically for the **1984 1987 Ford and Mercury 2.3L (140 cubic inch) L4 8-valve** inline-four engine, a powerplant renowned for its reliability and durability in applications ranging from the **Ford Escort, Mazda 626, Mercury Tracer, and Lincoln Continental** among others. Crafted from high-quality **cast iron**, this cylinder head is built to exacting standards, ensuring optimal combustion efficiency, structural integrity, and long-term performance. The **AJ5 designation** identifies it as part of the **E-series engine family**, which was widely used in Ford s compact and intermediate vehicles during the mid-1980s, known for its balance of simplicity and effectiveness. This head features **two valves per cylinder (intake and exhaust)**, arranged in a classic pushrod-operated configuration, with **hydraulic lifters** that eliminate the need for frequent valve adjustments, reducing maintenance hassles while maintaining smooth operation. The **combustion chambers** are precision-machined to promote efficient fuel-air mixing, contributing to better throttle response and fuel economy a critical consideration for the era s emphasis on efficiency. The **valve guides and seats** are designed to withstand the thermal and mechanical stresses of high-performance applications, though the stock head is typically paired with the stock **E43E engine**, which produces around **90 100 horsepower** in its base form. For those seeking enhanced performance, this head can be upgraded with **stiffer valve springs, larger valves, or high-flow exhaust ports**, allowing for increased airflow and potential power gains when paired with a tuned engine. The **oil passages and cooling galleries** are strategically placed to ensure even heat distribution, preventing hot spots that could lead to premature wear or failure. Whether you're restoring a classic Ford Escort, upgrading a project car, or maintaining a well-loved Mercury Tracer, the **E43E AJ5 cylinder head** remains a dependable choice, offering a blend of **durability, compatibility, and modifiable potential** that makes it a staple in the aftermarket and restoration communities. Proper installation, including the use of **high-quality gaskets, proper torque specifications, and a fresh head gasket**, is essential to ensure a leak-free and efficient sealing surface, preserving the head s performance for thousands of miles.

### **Pros and Cons of Buying a Ford E43E (AJ5) Cylinder Head for a 1984 1987 2.3L/140 L4 8V Engine**

1. **Direct Fitment** The E43E head is designed specifically for the AJ5 2.3L inline-four engine, ensuring proper bolt patterns, valve angles, and porting for optimal performance.

2. **Improved Flow** Compared to the stock E43D head, the E43E features larger intake and exhaust ports, better valve sizes (1.80" intake, 1.40" exhaust), and improved combustion chamber shape. This can enhance airflow and power output, especially when paired with a performance camshaft or forced induction.

3. **Better Head Studs** The E43E often comes with high-quality ARP or similar head studs, reducing the risk of head gasket failure under high RPM or boost.

4. **Compatibility with Upgrades** The head works well with aftermarket parts like high-flow intake manifolds (e.g., Edelbrock, Holley), performance cams, and turbocharging kits (e.g., Ford E4OD turbo or aftermarket turbos).

5. **Stock vs. Aftermarket Options** While stock E43E heads are rare, aftermarket versions (e.g., from **Ford Performance Parts, JE**, or **Crane Cams**) are available, offering consistency and reliability.

6. **Durability** The E43E is cast from high-quality aluminum, similar to the stock head, but with refinements that make it more robust for forced induction or high-RPM applications.

7. **Easier to Source Than AJ5 Blocks** Finding a complete AJ5 block can be difficult, but cylinder heads are more commonly available, making them a practical upgrade for those who already have a good block.

1. **Cost** A used or aftermarket E43E head can be expensive, especially if it comes with studs, gaskets, and machining. Prices often range from **$300 $600 **, depending on condition and source.

2. **Machining Required** Even if the head is new or lightly used, it will need **valve job, port matching, and decking** to ensure a proper seal with the block. This adds labor costs (typically **$200 $400** at a machine shop).

3. **Limited Stock Availability** Original E43E heads are no longer produced, so buyers must rely on used parts or aftermarket replications, which may have inconsistent quality.

4. **Potential for Weaknesses** Some aftermarket E43E heads may have thin casting walls or poor welds if not sourced from a reputable manufacturer. Always inspect for cracks or porosity.

5. **Requires Supporting Modifications** Simply swapping the head won t make a huge power gain unless paired with other upgrades (e.g., **camshaft, fuel system, intake, exhaust**). Expect **10 20% more power** over stock with a good tune.

6. **Head Gasket Challenges** Even with ARP studs, improper installation or overtightening can still cause gasket failure. A **high-quality head gasket (e.g., Fel-Pro or ARP)** is essential.

7. **Learning Curve** If you re not experienced with engine rebuilds, installing an E43E head requires careful attention to **torque specs, valve lash, and alignment** to avoid issues.

---

### **Conclusion & Recommendation**

The **Ford E43E (AJ5) cylinder head is a worthwhile upgrade** for the 1984 1987 2.3L/140 L4 engine if you re looking to **increase power, improve reliability under boost, or prepare the engine for forced induction**. The improved porting and valve sizes make it a significant step up from the stock E43D, especially when combined with other performance parts.

However, the **cost of the head itself plus machining and installation** means it s best suited for **serious builders** rather than casual enthusiasts. If you re only doing **mild street tuning (e.g., cam swap, intake, exhaust)**, the stock head may suffice with minor modifications.

- **If you re building a turbocharged or high-RPM engine**, the E43E is a **must-have upgrade** to prevent overheating and improve airflow.

- **If you re on a budget**, consider **porting the stock E43D head** (cheaper but less effective) or sticking with a **cam and intake upgrade** for a modest power bump.

- **Always source from a trusted seller** (e.g., **JE, Crane Cams, or a reputable parts store**) and **have it professionally machined** before installation.

- **Pair with supporting mods** (e.g., **ARP studs, high-flow intake, tuned fuel system**) to maximize gains.

**Final Verdict:** *The E43E is a solid choice for serious AJ5 engine builders, but it s not a "quick fix" it requires careful planning and investment to realize its full potential.*

Details:

Marshall Engines Remanufactured head. Free shipping USA lower 48. Ready to go, no core required.

part #: e43eaj5 price

• $350.00

specifications cylinderheapar:

• for makes: Mercury, Ford
• for years: 1984-1987
• brand: Ford
• mpn: E43e-aj5
• type: Cylinder Head
• items included: Head
• material: Cast Iron
• vintage part: No
• country of origin: United States

shipping cylinderheapar:

• service: USPS Ground Advantage
• cost: $0.00
• class: Standard
• carrier: USPS
• transit: 5-12 Days
• type: Calculated

general cylinderheapar:

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

seller cylinderheapar:

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

offer cylinderheapar:

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

returns cylinderheapar:

• policy: No Returns

payments cylinderheapar:

• other
• wallet: Paypal
• money order
• credit card: Diners-club

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