M8 +1mm CNC Porting (Milwaukee-Eight)
Harley-Davidson Milwaukee-Eight (M8) +1mm CNC cylinder head porting for real airflow gains. Precision 5‑axis machining, +1mm stainless valves, bronze guides, and a multi‑radius competition valve job deliver up to +15% intake and +31% exhaust flow. Built, assembled, and tested in-house at Ward Performance—ready for street or strip.
Our M8 +1mm CNC Porting service is designed for riders who demand high performance from their engines. Utilizing advanced 5-axis CNC machining, this service delivers precision-engineered porting that enhances both airflow and combustion efficiency. Featuring +1mm oversized stainless steel valves, a multi-radius competition valve job, and high-performance bronze intake and exhaust guides, this porting maximizes both power and durability.
At Ward Performance, each head undergoes meticulous testing, ensuring every valve seat, guide, and gasket surface is machined to exact specifications for optimal sealing and performance. We also offer a range of high-performance spring options tailored to meet the specific demands of your build. With our +1mm porting, you can expect up to a 15% increase in intake airflow and 31% more exhaust flow, delivering a noticeable boost in power and throttle response.
Whether you're looking for more power on the track or reliable performance for street riding, our M8 +1mm porting provides a proven upgrade, backed by years of expertise in racing and engine development.
Starting at $2,039.89
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+1MM oversized stainless steel valves: Larger than stock, these valves improve airflow and overall performance.
Extensive 5-axis CNC porting: Optimized for increased airflow efficiency, designed specifically for the +1MM valve upgrade.
Multi-radius competition valve job: Ensures a smooth transition from the valve seat to the inner port, maximizing airflow and enhancing performance.
Performance bronze valve guides: High-performance bronze guides are used for durability and precise valve movement.
Re-machining of head gasket surface: Ensures perfect sealing and compatibility with your engine setup.
High-lift spring kits (.640" lift): Available in steel or titanium, engineered for optimal valve control in high-performance applications.
Precision-assembled and tested for optimal performance: Each head is fully assembled and tested to meet Ward Performance’s high 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.
