S&S MK136 M8 +2MM OVERSIZED

A metallic engine cylinder head with black cooling fins and various openings, isolated on a black background.

Description:

Our S&S MK136 M8 WARD +2MM CNC Porting service transforms the already high-performance S&S MK136 heads by upgrading to +2MM oversized valves and reworking the ports for maximum airflow and combustion efficiency. Through advanced 5-axis CNC porting, we reshape both the intake and exhaust ports, along with a fully reworked combustion chamber, ensuring your engine delivers superior power and throttle response.

The upgrade features +2MM oversized stainless steel or titanium valves, allowing you to select either the durability of stainless steel or the lightweight performance of titanium for high-RPM builds. Each head is meticulously reassembled with new bronze valve guides, ensuring smooth valve operation, enhanced durability, and heat resistance.

At Ward Performance, we go beyond stock performance with rigorous testing and precision machining. Every head receives re-machined gasket surfaces to ensure a perfect seal and compatibility with your engine setup. This porting package offers riders the performance needed for both track and street use.

    • +2MM oversized stainless steel or titanium valves: Offering both long-term durability and lightweight options for high-RPM applications.

    • Extensive 5-axis CNC porting: Intake and exhaust ports are precision reshaped to unlock superior airflow and power gains.

    • Full CNC-machined combustion chamber: Designed to enhance combustion efficiency and optimize power delivery for your build.

    • New bronze valve guides: Installed on both intake and exhaust sides to ensure smooth movement, increased durability, and heat resistance.

    • Re-machined head gasket surface: Ensures a perfect seal and compatibility with your engine setup for peak performance.

    • High-lift spring kits (.640" lift): Available in both steel and titanium to match the specific demands of your build, ensuring reliable valve control at high RPMs.

    • Precision assembly and testing: Each head is meticulously assembled, inspected, and tested to meet Ward Performance’s high standards for fitment and performance.

    • 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.

    • 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!

Start Your Order For +2mm MK136 M8 Heads Online
  • Close-up of metallic engine cylinder with a brass-colored piston inside, mounted on a black engine part.

    Performance Bronze Valve Guides

    High-performance bronze guides are used for durability and precise valve movement.

  • Close-up of a metallic engine cylinder head with two empty cylinders and brass valves inside, on a black surface.

    Multi-radius Competition Valve Job

    Ensures a smooth transition from the valve seat to the inner port, maximizing airflow and enhancing performance.

  • Close-up of a cylinder head with two visible valve springs and part of the engine block.

    High-lift spring kits (.640" lift)

    Available in steel or titanium, engineered for optimal valve control in high-performance applications.

  • Close-up view of a cylinder head of an internal combustion engine, showing the combustion chambers and valve seats.

    Re-machining of head gasket surface

    Ensures perfect sealing and compatibility with your engine setup.

A black and silver engine cylinder head with cooling fins and valve components.
Close-up of a metallic engine cylinder head with a copper valve guide inside.
Automotive engine cylinder head with valves and camshaft components.
Close-up of an engine cylinder head showing two intake or exhaust ports with brass valve guides inside.
Close-up of a metallic engine component with brass rollers inside a circular chamber and threaded rods on the black housing.
Close-up of a black automotive cylinder head with metal springs and silver components, isolated on white background.
An engine cylinder head with four intake ports, metal surface, and black surrounding components.
Engine cylinder head with black cooling fins and silver machined surfaces.