WARD M8 +4MM FULL RACE CNC PORTING
Description:
Our M8 +4MM Full Race CNC Porting package is designed for riders who demand serious performance. These heads are engineered with advanced 5-axis CNC porting, creating large, high-flow ports that unlock your engine’s potential for both track and street use. Built for professional racers and performance enthusiasts, these heads deliver unmatched power gains and throttle response.
The +4MM oversized stainless steel valves, along with bronze intake and exhaust seats, are essential to achieving the larger valve size and maintaining durability under high-stress conditions. These heads also feature a reshaped CNC combustion chamber for optimized combustion efficiency. Additionally, titanium valve options are available for those seeking the lightest possible setup for maximum RPM and performance gains.
Integrated on every +4MM head is the 70mm square intake port modification and 2" exhaust flange upgrade, ensuring seamless compatibility and optimal airflow with aftermarket components.
Each head undergoes rigorous testing and hand assembly to ensure precise fitment and race-grade reliability. With each valve seat, guide, and gasket surface machined to exact tolerances, this package delivers a 24.27% increase in intake airflow and a 44.4% increase in exhaust flow—making it one of the most powerful upgrades available for Harley-Davidson engines.
Whether you're chasing records at the track or building the ultimate street machine, the +4MM Full Race CNC porting package offers the performance gains and reliability that serious riders demand.
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+4MM Oversized Stainless Steel Valves
Engineered for maximum airflow and durability under extreme conditions.
+4MM Oversized Titanium Valves (Optional)
Ultra-lightweight titanium valves for high RPM performance and reduced valve train mass.
Bronze Intake & Exhaust Seats
Essential for achieving the +4MM valve size and ensuring long-lasting reliability.
Extensive 5-Axis CNC Porting
Precision-engineered to optimize intake and exhaust flow for maximum power gains.
70mm Square Intake Port Modification
Enhances airflow compatibility with high-performance intake manifolds.
2" Exhaust Flange Modification
Ensures optimal exhaust flow to match high-output performance systems.
Reshaped CNC Combustion Chamber
Optimized for efficient combustion and tailored compression for your build.
Multi-Radius Competition Valve Job
Delivers smooth airflow through the entire valve lift range for maximum efficiency.
Performance Spring Kits (Optional)
Choose from Steel .640" High-Performance Springs or Ultra-Light Titanium .640" Springs for precise valve control.
Re-Machining of Head Gasket Surface
Ensures a perfect seal for peak performance and longevity.
Professional Assembly & Testing
Each head is thoroughly inspected, assembled, and tested to meet race-grade standards.
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Typically, this service requires you to send in your existing cylinder heads for modification.
For those looking for a quicker option, we offer off-the-shelf core heads that are fully prepared and ready to ship. If you have specific custom needs, we're more than happy to accommodate—just let us know what you're looking for.
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Still have questions or need help deciding?
No worries! We know performance upgrades can be a big decision, and we're here to help.
If you're unsure about anything, don't hesitate to reach out to us or visit our FAQ page for more information. We're just a message away and ready to assist!
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Performance Bronze Valve Guides
High-performance bronze guides are used for durability and precise valve movement.
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Multi-radius Competition Valve Job
Ensures a smooth transition from the valve seat to the inner port, maximizing airflow and enhancing performance.
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High-lift spring kits (.640" lift)
Available in steel or titanium, engineered for optimal valve control in high-performance applications.
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Re-machining of head gasket surface
Ensures perfect sealing and compatibility with your engine setup.
