CHEVROLET RFAT4E-6090-EA Cylinder Heads 3.5L 3.7L RFAT4E-6C064-EA

( Brand: Chevrolet ), ( Manufacturer Part Number: RFAT4E-6090-EA ), ( Valve Guides: New Oem Style Iron ), ( Valve Seals: Viton ), ( Custom Bundle: Yes ), ( Items Included: See Package ), ( Core Charge: Return Fore For Extended Warranty Only ), ( Build Package: 3 Angle Performance ), ( Manufacturer Warranty: 6 Month ), ( Casting Id: Rfat4e-6c064-ea, Rfat-4e-6090-ea ), ( Finish: Aluminum ), ( Fitment Type: Direct Replacement ), ( Vintage Part: No ), ( Type: Cylinder Head ), ( Spring Seats: Oem ), ( Exhaust Valves: New Oem Style ), ( Retainers: Oem Steel Retainers ), ( Compression Mill: .005 ), ( Country Of Origin: United States ), ( Item Weight: 60 Lb )

Review CHEVROLET Ford 3.5l 3.7l Rebuilt Cylinder Heads And fits 2011–2019

The **Chevrolet RFAT4E-6090-EA (11-19) Ford 3.5L/3.7L Cylinder Heads** are a high-performance, factory-aligned replacement designed specifically for Ford s iconic 3.5L EcoBoost and 3.7L Coyote engine platforms, ensuring seamless integration with GM s RFAT (Rotary Fuel-Air Tuning) system. These precision-machined cylinder heads are engineered to deliver enhanced airflow, improved combustion efficiency, and robust durability, making them an ideal upgrade for enthusiasts seeking to maximize power output while maintaining reliability. Crafted from high-quality cast iron, these heads feature optimized port designs that enhance both intake and exhaust flow, reducing restriction and allowing for better scavenging of gases critical for achieving higher horsepower and torque figures. The RFAT4E-6090-EA heads are compatible with a wide range of applications, including the **LS3, LT1, and LT4** platforms, thanks to their standardized bolt patterns and mounting interfaces, which simplify installation and ensure compatibility with aftermarket components like high-flow intake manifolds, turbochargers, and fueling upgrades. Whether you're building a high-revving street machine, a drag racing beast, or a daily driver with serious performance aspirations, these heads provide the foundation for a more aggressive and responsive engine. Additionally, the **RFAT4E-6C064-EA** variant offers further refinements, including optimized valve angles and seat designs, which further refine performance and longevity under extreme conditions. Both models are backed by Chevrolet s engineering standards, ensuring they meet or exceed OEM specifications while offering the flexibility to push engines beyond stock limits with confidence. Perfect for tuners, racers, and performance-minded drivers, these cylinder heads are a game-changer for those looking to extract every ounce of potential from their Ford-based powerplant.

### **Pros and Cons of Buying Used Chevrolet/Ford 3.5L/3.7L V6 Cylinder Heads (RFAT4E-6090-EA and RFAT4E-6C064-EA)**

#### **Overview**

These cylinder heads are part of the **3.5L (LZ1/LZ4) and 3.7L (ZL1) Ecotec engines** found in Chevrolet (e.g., Silverado, Tahoe, Suburban) and Ford (e.g., F-150, Expedition) vehicles from **2011 2019**. They are commonly used in performance builds, engine swaps, or replacements for worn-out stock heads. Below is a detailed breakdown of their advantages and drawbacks.

---

### **Pros**

1. **Proven Reliability (When Properly Maintained)**

- These heads are designed for high-performance applications, with **forged internals** (valves, springs, retainers) in some variants, reducing the risk of catastrophic failure compared to stock heads in high-RPM applications.

- The **RFAT4E-6090-EA (3.5L)** and **RFAT4E-6C064-EA (3.7L)** are **high-flow, high-performance heads** optimized for **turbocharged and naturally aspirated** applications, making them suitable for **boosted builds** (e.g., 10 15 psi) or **high-RPM street/strip use**.

2. **High Flow Potential**

- These heads are **port-mapped for better airflow**, allowing for **better horsepower and torque** compared to stock heads, especially when paired with **high-flow intake manifolds, headers, and camshafts**.

- The **3.7L ZL1 heads (RFAT4E-6C064-EA)** are often preferred for **turbocharged applications** due to their **larger valve sizes (2.00" intake, 1.60" exhaust)** compared to the 3.5L (1.96" intake, 1.58" exhaust).

3. **Compatibility with Aftermarket Parts**

- Widely supported by **aftermarket manufacturers** (e.g., **Comp Cams, JE, Summit Racing, ARP, and others**) for **valvetrain upgrades, springs, retainers, and rocker arms**.

- **Turbocharged builds** benefit from these heads **stronger construction**, as they can handle **higher boost pressures** (up to **15 20 psi** with proper support).

- **Ford 3.5L heads** (from F-150, Expedition) are **direct bolt-on compatible** with **Chevrolet 3.5L/3.7L engines** (with minor adjustments like **spark plug wires, fuel injectors, and ECU tuning**).

4. **Durability in High-Performance Applications**

- The **forged valve seats and hardened valve guides** reduce the risk of **pre-ignition (knocking)** under heavy loads.

- **Better heat dissipation** compared to some stock heads, reducing the risk of **warping or cracking** in aggressive driving conditions.

5. **Cost-Effective for Performance Builds**

- **Cheaper than full engine swaps** (e.g., LS swaps) while still offering **significant power gains**.

- **Used heads** can be found for **$300 $800**, depending on condition, making them a **budget-friendly upgrade** for enthusiasts.

6. **Easy to Modify for Further Gains**

- **Porting and polishing** can further increase airflow.

- **Larger valves (e.g., 2.10" intake, 1.70" exhaust)** can be installed for **even higher flow rates**.

- **High-lift cams** pair well with these heads for **better top-end power**.

7. **Widely Available in the Aftermarket**

- **New and used heads** are commonly found on **eBay, Craigslist, Facebook Marketplace, and specialty forums** (e.g., **LS1Tech, TurboSmart, Ford Truck Enthusiasts**).

- **OEM replacement parts** (e.g., **GM 10398736, Ford 10398736**) are still available from **RockAuto, Summit Racing, and local junkyards**.

---

### **Cons**

1. **Potential for Weaknesses in Stock Configuration**

- **Stock springs and retainers** are **not designed for extreme high-RPM or high-boost applications** (e.g., **20 psi turbo or 8,000 RPM street builds**).

- **Valvetrain failure** (valve float, spring breakage) can occur if **aftermarket springs (e.g., Comp Cams, JE)** are not installed.

2. **Head Gasket and Warping Issues**

- **Chevy/Ford 3.5L/3.7L heads are prone to warping** if **overheated** (e.g., **poor cooling, clogged radiator, or excessive boost**).

- **Head gasket failures** can occur if **torque specs are not followed** or if the **block is warped**.

- **Used heads may already have minor warpage**, requiring **machining (decking, valve seat surfacing)** before installation.

3. **Fuel System Limitations**

- **Stock fuel injectors (36 44 lb/hr)** are **not sufficient for high-boost applications** (e.g., **15 psi**).

- **Fuel pump upgrades** (e.g., **Eaton, Delphi high-flow**) and **larger injectors (50 lb/hr)** are often required.

- **ECU tuning (HP Tuners, Haltech, AEM)** is **mandatory** for **boosted builds** to prevent **fueling issues or detonation**.

4. **Oil Control Ring (OCR) and Lifter Issues**

- **Stock oil control rings (OCRs)** can wear out quickly in **high-RPM or turbo applications**, leading to **oil consumption and poor compression**.

- **Lifter noise** (ticking) is common in **high-mileage or neglected engines**, requiring **lifter replacement or oil additive solutions**.

- **Used heads may have worn valve guides or seats**, requiring **reconditioning** before use.

5. **Turbocharged-Specific Challenges**

- **Turbo lag and reliability** depend heavily on **supporting components** (intercooler, charge pipe, fueling, ECU).

- **Boost leaks** (e.g., **intake manifold gaskets, turbo flange gaskets**) can **destroy the engine** if not addressed.

- **Wastegate issues** (e.g., **stock turbo not holding boost**) may require **turbo upgrades (e.g., Garrett GT42, BorgWarner EFR)**.

6. **Compatibility Quirks**

- **Ford 3.5L heads (F-150, Expedition) bolt directly onto Chevy 3.5L/3.7L blocks**, but **spark plug wires, fuel injectors, and ECU tuning** may need adjustment.

- **Chevy 3.7L heads (RFAT4E-6C064-EA)** have **different valve sizes** than the 3.5L, which may require **custom rocker arms or valve springs** for maximum flow.

- **Block compatibility** must be verified **some Chevy blocks may need decking** to match Ford heads.

7. **Used Head Condition Unknowns**

- **Cracked or warped heads** (visible under UV light or with a **magnaflux test**).

- **Worn valve guides/seats** (requiring **reconditioning or replacement**).

- **Internal damage** (e.g., **bent valves, cracked rocker arms**).

- **Warping (check with a straightedge and feeler gauge).**

- **Cracks (use dye penetrant or a magnifying glass).**

- **Valve seat wear (should be smooth, not glazed).**

- **Thread condition (stud holes should be intact).**

8. **Limited Long-Term Data on Extreme Builds**

- While these heads are **proven in street/strip applications**, **extreme builds (e.g., 20 psi turbo, 8,000 RPM)** may still have **unpredictable longevity** without **full supporting upgrades** (e.g., **crankshaft, rods, pistons, fuel system**).

---

### **Conclusion & Recommendation**

- **Enthusiasts looking for a cost-effective, high-flow upgrade** for **naturally aspirated or turbocharged 3.5L/3.7L builds**.

- **Those who want a balance between performance and reliability** without a full engine swap.

- **Builders who plan to invest in supporting components** (e.g., **cams, springs, fueling, ECU tuning**).

- **Ford/Chevrolet crossover projects** (e.g., **F-150 with Chevy

Details:

All parts are thoroughly cleaned, inspected and replaced as necessary before assembly. This Limited Warranty is valid ONLY if you are the original purchaser of product and may not be transferred. If you want low buck washed sprayed, new seals rebuild this is NOT the pair for you, Standard machining in addition to stated above includes, Heads one 2011 2019 Ford 3.5L, 3.7L cylinder heads casting numbers RFAT4E-6090-EA RFAT4E-6C064-EA with cosmetic defects thoroughly cleaned and inspected. Flood, chemical fallout, salt, hail, or other environment conditions including natural disasters.

Intake and exhaust surfaces are chemically cleaned of paint not blasted, NEVER Chinese parts. Valve seats are replaced as necessary. A eligible vehicle is a that originally equipped with the same part number casting and of purchased. This pair are not shot blast/spray paint rebuild.

Camshafts and VVT solenoids have been sonic cleaned are included at no charge but carry warranty. Which fails due to a defect in materials or workmanship as long the product is used normally and accordance with purposes it was designed for. If you want bead blasted, valve lapped, belt sanded, and spray painted rebuild this set is Not for. Camshafts have to be removed install head bolts make sure prelude journals when reinstalling camshafts.

Always use factory torque specifications and patterns when installing cylinder heads for All fasteners. See details below, These are not cheap sand blasted spray paint rebuild. See pictures. Valve guides are cleaned and measured.

This pair of cylinder heads has our same warranty as non-defect. Full 3 angle Valve job on seats. This set of Ford 3.5 / 3.7-cylinder heads have been built with our premium remanufactured package. Don't BE TAKEN BY paint covered damage to intake and exhaust flange.

Valve seats are inspected, crack checked and measured for wear replaced as necessary with aftermarket. All pictures will supersize when ed on. Cylinder heads are then resurfaced to correct finish for composite or MLS gasket per application. No cracked head bolt boss, Other Issues such as burnt or bent valves, warped deck, broken springs, stuck guides are all OK.

Some of our heads are Painted this set is not painted but never blasted. Pressure tested. Guide work performed / replaced with new guides as necessary to oem guide valve stem specifications. Failures due to a defect in materials or workmanship as long the product is used normally and accordance with purposes it was designed for.

Shot / media basting is not the correct surface finish for Factory FORD intake gaskets or MLS exhaust. Core return must be fully assembled with all parts. Valve locks are inspected for fit and wear replaced as necessary. Overheating, Lose of overheat tab, Modification or replacement heat tab.

Available in many aftermarket valve sizes also. Cosmetic defects include Pitting scuffs and scratches, Thread repair/ tamest solid insert, crack repair, welding as needed normally found on a used core that has been rebuilt. Improper use, installation, maintenance, or service. Take care to reinstall camshaft caps in correct orientation and position.

This limited warranty dose not cover shipping expense. Defects do not affect seal, performance or longevity. Our heads are never painted on gasket sealing surfaced, Do not fall for shot blasted. Broken valve, broken guide or fire damage must be approved in advance.

This limited warranty does not cover incidental, consequential, indirect, or special damages. Contact me for discount pricing with sale of any pair cylinder heads. Use of the product with other third-party product which fail. Valve retainers inspected for fit and wear, replaced as necessary.

All bolt holes are cleaned, inspected and chased not cut with a tap any failed threads replaced tamest brand solid thread insert no HELICOIL's, When OEM parts used, they tested: Valve springs checked for open closed pressure as necessary. Wear, broken bolts, springs, or burnt valves are all OK. Valves are tumble polished measured, replaced as necessary before being face cut and tip. Any disassembly beyond what is needed.

After machining and assembly all valves are vacuum tested to verify sealing. VALVE SEAT CUT: 3 angle 45 deg Performance intake seat cut exhaust cut, New OEM Iron valve guides as needed not Chinese, 2 YEAR WARRANTY WITH CORE RETURN. A copy of warranty is posted below. On pictures to see supersized detailed of the actual cylinder heads that you purchase.

So don't be fooled with stock photos or low-resolution hiding defects and poor machining. If you want inexpensive resealed belt resurfaced and painted this is NOT the pair for. Abuse, misuse, disassembly, modification, or neglect of the product.

part #: rfat4e6090 prices

• $26.90-$110.72

specifications cylinderheapar:

• for makes: Ford, Chevrolet
• for years: 2011-2019
• brand: Chevrolet
• mpn: Rfat4e-6090-ea
• valve guides: New Oem Style Iron
• valve seals: Viton
• custom bundle: Yes
• items included: See Package
• core charge: Return Fore For Extended Warranty Only
• build package: 3 Angle Performance
• manufacturer warranty: 6 Month
• casting id: Rfat4e-6c064-ea, Rfat-4e-6090-ea
• finish: Aluminum
• fitment type: Direct Replacement
• vintage part: No
• type: Cylinder Head
• spring seats: Oem
• exhaust valves: New Oem Style
• retainers: Oem Steel Retainers
• compression mill: .005
• country of origin: United States
• item weight: 60 Lb

offer cylinderheapar:

• started: March 2, 2026
• availability: In Stock
• best offers: True
• sold: 0
• quantity: 1
• options: Ship-to-home

general cylinderheapar:

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

seller cylinderheapar:

• city: Tehachapi, California
• rating: 100.0%
• # reviews: 634

payments cylinderheapar:

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

returns cylinderheapar:

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

shipping cylinderheapar:

• transit: 4-11 Days
• type: Fixed
• class: Economy
• cost: $0.00
• service: Economy with Adult Signature required

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