Center-Cooled M8 +2MM OVERSIZED (Gen. 2)
Description:
Our M8 Center-Cooled +2MM CNC Porting service is designed for riders demanding peak performance and superior cooling efficiency. Optimized specifically for Harley-Davidson’s center-cooled Milwaukee-Eight engines, this package utilizes advanced 5-axis CNC porting to unlock exceptional airflow and combustion efficiency, ideal for high-compression builds and high-stress riding.
The upgrade features +2MM oversized stainless steel intake valves, which require the replacement of the stock intake seats with larger bronze intake seats to accommodate the increased valve size. On the exhaust side, the stock seats remain intact, preserving durability while ensuring optimal exhaust flow. This service also includes a full CNC-machined combustion chamber, ensuring maximum efficiency and compatibility with the enhanced airflow dynamics.
At Ward Performance, each head undergoes rigorous testing and precision machining to meet exacting standards. Every valve seat, guide, and gasket surface is carefully machined for perfect sealing and optimal performance. With this +2MM porting package, you can expect a 17.6% increase in intake airflow and a 31.1% increase in exhaust flow, delivering impressive power gains and sharper throttle response.
Whether you're chasing track victories or building a high-performance street machine, the M8 Center-Cooled +2MM CNC Porting offers a powerful combination of enhanced cooling, airflow, and power. Backed by years of racing expertise and engine development, this upgrade ensures your engine operates at peak performance under the most demanding conditions.
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+2MM oversized stainless steel or titanium valves: Available in both stainless steel for durability and titanium for ultra-lightweight, high-RPM performance.
Extensive 5-axis CNC porting: Optimized for improved intake and exhaust flow, designed to complement the +2MM valve upgrade for maximum power gains.
Bronze intake valve seats: Upgraded from stock to accommodate the larger +2MM intake valves, enhancing airflow and durability for high-performance builds. Stock exhaust seats remain in place.
New bronze valve guides: Installed on both intake and exhaust sides to ensure smooth valve movement, increased durability, and heat resistance for long-lasting performance.
Full CNC-machined combustion chamber: Included to ensure precise combustion efficiency, optimized for increased airflow and compression ratios.
Re-machined head gasket surface: Ensures a perfect seal for compatibility with your engine setup and optimal performance.
High-lift spring kits (.640" lift): Available in steel or titanium, engineered to meet the demands of the +2MM porting and ensure reliable valve control at high RPMs.
Precision assembly and testing: Each head is assembled, inspected, and tested to meet Ward Performance’s exacting standards for fitment and performance.
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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.
