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
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+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.
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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.
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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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Engineered for 2" Exhaust (Required)
Requires a Burns NhB (WtF) exhaust system or custom-welded 2" exhaust to ensure peak engine performance.
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Re-machining of head gasket surface
Ensures perfect sealing and compatibility with your engine setup.
