What is the Ward Performance SE Center-Cooled M8 +2MM CNC Porting?

The Ward Performance SE Center-Cooled M8 +2MM CNC Porting is a specialized service for customer-supplied Harley-Davidson Screamin' Eagle Center-Cooled Milwaukee-Eight cylinder heads. It enhances the factory +2MM oversized valves by reshaping the intake and exhaust ports using advanced 5-axis CNC porting to unlock exceptional airflow and combustion efficiency.

What kind of performance improvements can I expect from this SE Center-Cooled M8 porting service?

You can expect significant performance gains, including a 10% increase in intake airflow and a 5.1% increase in exhaust flow. This delivers maximum power gains, sharper throttle response, and a noticeable overall performance improvement for your engine.

What specific components or processes are involved in the SE Center-Cooled M8 +2MM CNC Porting?

This service focuses on reshaping the intake and exhaust ports using 5-axis CNC machining. While the factory heads already feature +2MM oversized valves, our process refines the porting for optimal airflow. We also offer lightweight titanium valve options for higher RPM potential and ensure meticulous machining and flow testing.

Is the Ward Performance SE Center-Cooled M8 +2MM CNC Porting suitable for racing or high-performance street use?

Yes, absolutely. This porting package is designed for riders demanding peak performance, whether chasing track victories or building a high-performance street machine. It offers a powerful combination of enhanced cooling, airflow, and power, backed by years of racing expertise and engine development, to ensure your engine operates at peak performance under the most demanding conditions.

SE Center-Cooled M8 +4MM OVERSIZED (Gen. 2)

Unleash maximum airflow and extreme performance from your Gen. 2 SE center-cooled heads. This package features +4mm oversized valves, extensive 5-axis CNC porting, and a required 2" exhaust mod to support big-inch, high-RPM builds with serious power goals.

Our Gen 2 SE Center-Cooled M8 +4MM CNC Porting service is engineered for riders chasing maximum airflow and extreme performance from their Milwaukee-Eight. Leveraging advanced 5-axis CNC technology, this service provides a no-compromise upgrade with fully reshaped intake and exhaust ports, specifically designed to support big-inch, high-RPM builds with serious power goals.

This upgrade includes +4MM oversized valves, with options in either stainless steel for aggressive street builds or titanium for race-only applications. We also include custom bronze intake and exhaust seats, new bronze valve guides, and a multi-angle competition valve job for unmatched sealing and flow.

Each set of heads undergoes extensive 5-axis CNC porting and a required 2” exhaust port modification, which is designed to work with a Burns NhB (WtF) exhaust system or a custom 2” header. We can tailor the chamber volume and surface height to match your specific target compression ratio or displacement needs. At Ward Performance, every head is flowbench-developed, precision-assembled, and fully inspected to ensure you receive a race-level product engineered for top-tier performance on the track or street.

Starting at: $3,272.52

- +4MM oversized stainless steel or titanium valves: Choose from stainless steel for aggressive street use or titanium for race-only builds focused on ultra-high RPM and minimal valvetrain mass.
- Extensive 5-axis CNC porting: Deep reshaping of both intake and exhaust ports to unlock maximum airflow and overall power gains.
- Custom bronze intake and exhaust seats: Required to accommodate the large +4MM valves while offering long-term durability and superior heat management.
- New bronze valve guides: Custom-fit bronze guides on intake and exhaust sides for precise valve control and improved thermal performance.
- Multi-angle competition valve job: Precision-machined seat geometry for optimal airflow and sealing.
- 2” exhaust port modification (required): Mandatory for this setup, designed specifically for use with Burns N.H.B. (WTF) exhausts or custom 2” headers.
- Re-machining of head gasket surface: Machined for flatness, sealing, and to achieve your target compression ratio and combustion chamber volume.
- Titanium .640” lift valve spring kit: A high-pressure spring kit engineered to handle the demands of this build.
- Typically, this service requires you to send in your existing cylinder heads for modification. We may have cores available depending on availability.
- We can also work with you on custom needs, including specific chamber volumes or spring pressures to meet your build requirements.
- 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!

Start Your Order For +2mm SE Center-Cooled M8 Heads

Performance Bronze Valve Guides

High-performance bronze guides are used for durability and precise valve movement.
Multi-radius Competition Valve Job

Ensures a smooth transition from the valve seat to the inner port, maximizing airflow and enhancing performance.
Engineered for 2" Exhaust (Required)

Requires a Burns NhB (WtF) exhaust system or custom-welded 2" exhaust to ensure peak engine performance.
Re-machining of head gasket surface

Ensures perfect sealing and compatibility with your engine setup.