EA888 Gen3 CNC Ported Cylinder Head – Stage 4 & Stage 5

The Ultimate Rebuilt EA888 Gen3 Cylinder Head for High-Performance and 1000+ HP Builds

Engineered for enthusiasts and professional race teams who demand maximum airflow, uncompromising reliability, and the highest level of machining precision, our Stage 4 and Stage 5 cylinder heads represent years of development on the EA888 Gen3 platform.

Every cylinder head is supplied as a professionally rebuilt unit, thoroughly inspected, precision-machined, and assembled to ensure exceptional reliability and performance.

Compatibility

Our cylinder heads are compatible with all Volkswagen Audi Group EA888 Gen3 1.8L and 2.0L engines, including (but not limited to):

• Volkswagen Golf MK5 GTI
• Volkswagen Golf 7 GTI
• Volkswagen Golf 7R
• Volkswagen Golf 7.5R
• Audi S3 8V
• Audi S3 8V Facelift
• Audi TT/TTS (EA888 Gen3)
• Audi A3 8V
• Volkswagen Arteon
• Volkswagen Passat B8
• Volkswagen Tiguan
• Škoda Octavia vRS
• SEAT Leon Cupra

This cylinder head is a direct replacement for all EA888 Gen3 1.8L and 2.0L cylinder heads, making it an ideal solution for both street performance and professional motorsport applications.

Precision 5-Axis Intake Port Development

Every intake port is precision-machined on our HAAS UMC-1000 5-axis machining center to achieve exceptional port consistency, optimized airflow velocity, and balanced cylinder filling.

Our proprietary intake port design improves volumetric efficiency while maintaining excellent air speed, resulting in faster turbo response, improved cylinder filling, and increased airflow throughout the entire RPM range.

Proprietary Hybrid Exhaust Port Technology

The EA888 Gen3 exhaust ports cannot be fully optimized using conventional CNC machining alone due to their complex internal geometry.

To overcome this limitation, we developed our own proprietary machining process.

Each exhaust port is produced using a combination of:

• 5-Axis CNC Port Machining
• Custom-Engineered Material Removal Tools
• Precision Hand Finishing

This hybrid manufacturing process allows us to reshape areas that are inaccessible to CNC tooling alone, maximizing the effectiveness of the larger exhaust valve seats and significantly increasing exhaust flow where conventional porting reaches its limits.

Stage 4

Our Stage 4 cylinder head features oversized +1 mm exhaust valve seats, allowing installation of larger exhaust valves while maintaining excellent port velocity.

Ideal for high-performance street cars, track applications, and hybrid turbocharger setups.

Stage 5

Our flagship Stage 5 cylinder head features +2 mm oversized exhaust valve seats, allowing installation of +2 mm larger exhaust valves together with our most aggressive exhaust port development.

You can add +1mm intake valves on this option.

Designed for extreme motorsport applications, Stage 5 fully utilizes the increased valve diameter and optimized exhaust port geometry to support 1000+ horsepower engine builds, when combined with an appropriately engineered engine package.

AMCO45 Competition Valve Seats

Every cylinder head is equipped with premium AMCO45 valve seats, specifically selected for their exceptional resistance to thermal fatigue and extreme operating temperatures.

Compared to conventional valve seat materials, AMCO45 provides:

• Outstanding thermal stability
• Superior wear resistance
• Excellent sealing under extreme cylinder pressures
• Reduced long-term valve seat recession
• Increased durability in high-performance and motorsport applications

Combined with our precision valve seat machining, this design contributes to improved valvetrain stability during sustained high-RPM operation.

Optimized Combustion Chambers

Each combustion chamber is precision-machined and matched to achieve identical chamber geometry across all cylinders.

This optimization promotes:

• Uniform combustion
• Improved flame propagation
• Reduced hot spots
• Lower tendency toward abnormal combustion under high boost
• Improved combustion efficiency

The result is a more stable and reliable engine operating under extreme cylinder pressures.

Competition Valve Guide System

Our upgraded valve guides feature an integrated retention stop designed to prevent guide movement under high spring pressures.

This provides increased reliability when used with performance valve springs and aggressive camshaft profiles, maintaining accurate valve train geometry even during prolonged high-RPM operation.

Our upgraded valve guides are specifically engineered for high-performance and motorsport applications.

Each guide incorporates an integrated mechanical retention stop to prevent guide movement under the increased loads generated by high-pressure valve springs and sustained high-RPM operation.

To provide additional valvetrain clearance, the valve guides are repositioned deeper into the cylinder head, allowing compatibility with camshafts offering up to 14 mm of valve lift without interference between the valve spring retainer and the valve guide seal.

This modification makes the cylinder head suitable for aggressive camshaft profiles while maintaining reliable valvetrain geometry and durability under extreme operating conditions.

Key Benefits

• Integrated valve guide retention stop
• Repositioned valve guides for increased retainer clearance
• Compatible with camshafts up to 14 mm valve lift
• Designed for high spring pressures and sustained high-RPM operation
• Improved valvetrain reliability for street, drag racing, and circuit applications

High-Flow Intake Port Design

The factory intake runner flap provisions are permanently removed, creating a smooth and unrestricted intake path.

By eliminating these airflow obstructions, turbulence and pressure losses are significantly reduced, allowing the intake ports to achieve their maximum flow potential.

Why Choose Our Cylinder Head?

Unlike conventional CNC-ported cylinder heads, every aspect of our design has been engineered specifically for the EA888 Gen3 platform.

Features

• Professionally Rebuilt Cylinder Head
• Direct Fit for all EA888 Gen3 1.8L & 2.0L Engines
• Complete 5-Axis CNC Intake Port Development
• Proprietary Hybrid Exhaust Port Technology
• Stage 4 (+1 mm Exhaust Valve Seats)
• Stage 5 (+2 mm Exhaust Valve Seats)
• Premium AMCO45 Competition Valve Seats
• Optimized Combustion Chambers
• Competition Valve Guide Retention System
• High-Flow Flap Delete Intake Design
• Motorsport-Level Machining Quality
• Designed to Support 1000+ HP Engine Builds*

Every cylinder head is developed, machined, rebuilt, assembled, and quality inspected entirely in-house using professional CNC equipment and proprietary manufacturing techniques developed through extensive testing on the EA888 Gen3 platform.

Precision Reconditioning & Multi-Angle Valve Seat Machining

Every cylinder head undergoes a complete professional reconditioning process before assembly.

This includes precision resurfacing, pressure testing, and meticulous inspection to ensure every cylinder head meets our motorsport-quality standards.

The valve seats are precision-machined using a multi-angle competition valve seat profile, specifically developed to maximize airflow into and out of the combustion chamber.

Unlike conventional single-angle seat machining, our multi-angle valve seat geometry provides:

• Increased intake airflow efficiency
• Improved exhaust gas evacuation
• Smoother airflow transition between the ports and the combustion chamber
• Enhanced cylinder filling
• Improved combustion efficiency
• Greater high-RPM performance potential

Each valve seat is individually machined to extremely tight tolerances, ensuring optimum valve sealing while maximizing airflow characteristics.

Combined with our CNC-developed ports and premium AMCO45 valve seats, this process contributes to the exceptional performance and reliability expected from a professional motorsport cylinder head.

Built for Power. Engineered for Reliability. Manufactured Without Compromise.

Designed for enthusiasts who demand the highest level of engineering, our Stage 4 and Stage 5 cylinder heads deliver the airflow, durability, and precision required for today's most powerful EA888 Gen3 engine builds.

*Maximum horsepower capability depends on the complete engine configuration, turbocharger selection, fuel system, engine calibration, and supporting components.

Built for Power. Engineered for Reliability. Proven by Precision.

When maximum airflow, durability, and performance matter, our Stage 4 and Stage 5 cylinder heads deliver the level of engineering required for today's highest-output EA888 Gen3 engine builds.

*Actual horsepower capability depends on the complete engine configuration, turbocharger, fuel system, engine management calibration, and supporting components.

Welcome to our state-of-the-art CNC 5-Axis Ported Cylinder Heads, where precision meets performance. Elevate your engine to new heights with our cutting-edge technology, offering unparalleled accuracy for enthusiasts who demand the best.

At the heart of our Cylinder Head offering is our HAAS CNC 5-Axis machining, a technological marvel that takes precision engineering to the next level. Unlike traditional porting methods, our 5-Axis CNC machine allows us to precisely sculpt and refine every contour of our remanufactured cylinder heads from multiple angles. This level of precision ensures uniformity and consistency across all ports, resulting in optimal airflow distribution and combustion efficiency.

What sets our CNC 5-Axis Ported Cylinder Heads apart is the ability to achieve complex shapes and intricate designs that would be challenging with conventional methods. The five-axis capability allows us to navigate around intricate geometries, ensuring that every nook and cranny of the port is meticulously addressed. This advanced technology enables us to create port configurations that maximize airflow without compromising structural integrity.

The advantages of CNC 5-Axis Porting extend beyond precision alone. Expect a finely tuned engine with enhanced power delivery, improved throttle response, and a broader power band. The accuracy of our CNC machining ensures that each remanufactured cylinder head is a mirror image of the next, guaranteeing consistent and predictable performance across all cylinders.

But that's not all – our commitment to excellence doesn't end with precision engineering. Rest assured, our work is thoroughly tested on SuperFlow, ensuring that your engine's performance is not just precise on paper but proven in real-world testing.

With our CNC 5-Axis Ported Cylinder Heads, you receive a fully remanufactured and ported cylinder head, ready to be installed—no need to send us your original unit. Experience the pinnacle of engine performance with our expertly engineered solutions, designed for those who accept nothing less than perfection.

*VALVES , VALVE SPRINGS AND RETAINERS ARE NOT INCLUDING*