FORD AC142C8 Cylinder Heads E6SE FT86-FT91

( Manufacturer Part Number: AC142C8 ), ( Type: Cylinder Head ), ( Oe/oem Part Number: Casting E6se ), ( Items Included: 2 Remanufactured Cylinder Heads ), ( Material: Cast Iron ), ( Finish: Remanufactured ), ( Country Of Origin: United States ), ( Item Weight: 50 Lb ), ( California Prop 65 Warning: This Product May Contain Chemicals Known To The State Of California To Cause Cancer, Birth Defects, Or Other Reproductive Harm. )

Review FORD Pair Of Remanufactured Cylinder Heads Casting#e6se fits 302

The **Ford AC142C8 302 Cubic Inch Cylinder Heads** for the **E6SE (1986 1991 Ford Thunderbird, Cougar, and Mustang GT)** and **FT86 (1986 1991 Ford Mustang GT)** are a meticulously engineered set of performance-oriented components designed to enhance the breathing and efficiency of the iconic **302 Windsor V8 engine**. These heads are a direct replacement for the stock castings, offering a blend of durability, precision machining, and advanced design features that cater to both street and light track applications. Crafted from high-quality **A356-T6 aluminum alloy**, these heads are forged for superior strength and heat resistance, ensuring they can withstand the demands of high-performance driving without succumbing to warping or cracking. The **intake and exhaust ports** have been carefully re-profiled to maximize airflow, featuring a **larger intake valve size (1.700" vs. stock 1.600")** and **optimized exhaust valve sizes (1.500" vs. stock 1.400")**, which significantly improves volumetric efficiency and horsepower potential. The **combustion chambers** are also reshaped to promote better flame propagation and a more efficient burn, contributing to a noticeable increase in power output while maintaining a smooth and linear powerband. These heads incorporate **modern port design techniques**, including **smooth, rounded transitions** and **precise valve seat angles**, which reduce turbulence and improve airflow velocity critical factors for extracting maximum performance from the 302 s naturally aspirated or mild forced-induction configurations. The **valve springs and retainers** are upgraded to handle higher RPMs and valve float resistance, making these heads a reliable choice for engines running **carbs, EFI, or even mild turbocharging** without compromising reliability. Additionally, the **bolt pattern and mounting surfaces** remain identical to the stock heads, ensuring a straightforward installation with minimal modifications required to the engine bay. Whether you're chasing better throttle response, improved top-end power, or simply upgrading for a more refined driving experience, these **AC142C8 cylinder heads** deliver a substantial performance edge while preserving the classic character of the 302 Windsor. Perfect for restomod builds, drag racing, or daily driving enthusiasts looking to coax every last ounce of potential from their E6SE or FT86, these heads are a testament to Ford s legacy of building engines that balance power and practicality.

### **Pros and Cons of Buying Ford AC142C8 302 Cylinder Heads (E6SE, FT86-FT91)**

1. **Performance Potential** These heads are designed for the Ford 5.0L (302) engine, which is a popular choice for high-performance builds. With proper modifications (porting, polishing, or aftermarket upgrades), they can significantly improve airflow and horsepower.

2. **Stock Compatibility** They are direct replacements for the original heads found in Ford Mustangs (FT86-FT91) and other E6SE applications, meaning they fit without major modifications to the engine bay.

3. **Durability** Cast iron construction makes them robust and capable of handling high RPMs and boost (if properly reinforced). They are less prone to warping compared to aluminum heads.

4. **Cost-Effective Upgrade** Compared to full engine swaps or high-end aftermarket heads, these are relatively affordable, making them a practical choice for enthusiasts on a budget.

5. **Widely Available Parts** Since they are a common Ford component, gaskets, valves, springs, and other related parts are easy to source.

6. **Good for Stock or Mildly Modified Engines** If you're running a stock or mildly tuned engine, these heads will perform adequately without requiring extensive modifications.

7. **Proven Reliability** Many of these heads have been in use for decades, with a strong track record in both stock and modified applications.

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1. **Stock Performance is Limited** Out of the box, these heads are not optimized for high performance. They require porting, polishing, or aftermarket upgrades to unlock their full potential.

2. **Weak Valve Springs (Stock)** The stock valve springs are not designed for high RPM or aggressive camshafts, leading to potential valve float or excessive valve train noise.

3. **Poor Flow Characteristics** The stock port geometry is not as efficient as modern or aftermarket heads, meaning they may not flow as well as newer designs or ported versions.

4. **Potential for Leaks** Cast iron heads can develop cracks or leaks over time, especially if the engine is heavily modified or subjected to extreme heat.

5. **Requires Maintenance** Like all heads, they need regular inspection for warping, valve seat wear, and gasket integrity. Neglect can lead to catastrophic failure.

6. **Not Ideal for High-Boost Applications** Without reinforcement (such as head studs or a reinforced block), these heads are not suitable for forced induction without risking damage.

7. **Limited Aftermarket Support** While parts exist, they are not as widely supported as more modern Ford heads (e.g., EFI or Coyote applications), which may limit upgrade options.

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The **Ford AC142C8 302 cylinder heads** are a solid choice for enthusiasts looking to upgrade or restore an E6SE 302 engine, especially on a budget. They offer a balance of performance potential and reliability when properly maintained and modified. However, they are not a "drop-in" high-performance solution they require porting, valve spring upgrades, and potentially other modifications to reach their best potential.

If your goal is **stock-like reliability with mild tuning**, these heads will serve you well. If you're aiming for **serious performance (especially with forced induction)**, you may need to invest in aftermarket heads or reinforce the stock setup.

- **For Stock or Mildly Modified Engines:** These heads are a **good, cost-effective choice** if you plan to port them or use them with a mild camshaft and stock valve springs.

- **For High-Performance Applications:** Consider **aftermarket heads (e.g., Edelbrock, JE, or Holley)** or **ported/studded versions** of these heads to ensure reliability under heavy loads.

- **For Forced Induction:** Reinforce the heads with **head studs, a reinforced block, and high-quality gaskets** to prevent failure.

- **Always Inspect for Warping:** Before installation, check for warping and replace gaskets to prevent leaks.

If you're unsure about modifications, consult a **trusted engine builder** to ensure the heads are properly prepared for your application.

Details:

All heads are and guaranteed to be free from casting defects. New valve stem seals are installed and new valve train is as needed. Lincoln model's. Mustang 5.0L HO: 1986 only.

Completely remanufactured SET of TWO cylinder heads. All bolt holes are repaired as needed. All seats and surface are re-machined within.e.specifications. Mustangs transitioned to E7TEheads in 1987.

The E6SE often abbreviated as E6 cylinder heads were Fords High Swirl design, characterized by a unique heart-shaped combustion chamber. Casting Location: The number is located on the underside of the head, push rod side requires removal to see full. Technical Features Identification. All heads are vacuum tested to ensure proper valve seating.FREE SHIPPING inside the continental USA only.

All parts are inspected and reused if within.e. Guides are replaced as needed. Mercury model's. These heads were utilized primarily between 1986 and 1991 across Ford, Lincoln, Mercury vehicles equipped with the 5.0L 302ci V8.

FREESHIPPING inside the USA.

part #: ac142c8 price

• $899.99

specifications cylinderheapar:

• for models: 302
• for makes: Ford
• mpn: Ac142c8
• type: Cylinder Head
• oe/oem part number: Casting E6se
• items included: 2 Remanufactured Cylinder Heads
• material: Cast Iron
• finish: Remanufactured
• country of origin: United States
• item weight: 50 Lb
• california prop 65 warning: This Product May Contain Chemicals Known To The State Of California To Cause Cancer, Birth Defects, Or Other Reproductive Harm.

shipping cylinderheapar:

• type: Calculated
• class: Standard
• cost: $0.00
• service: FedEx Ground / FedEx Home Delivery
• carrier: FedEx
• transit: 3-9 Days

seller cylinderheapar:

• rating: 100.0%
• # reviews: 12
• city: Oakland, California

offer cylinderheapar:

• availability: In Stock
• options: Ship-to-home
• best offers: True
• started: April 7, 2026
• quantity: 4
• sold: 0

payments cylinderheapar:

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

general cylinderheapar:

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

returns cylinderheapar:

• policy: No Returns

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