Ward 130" Big Bore Kit for m8

Description:

Take your Milwaukee-Eight (M8) engine to the next level with the Ward Performance 130" Big Bore Kit—the ultimate combination of power, torque, and reliability. This kit features American-made 4.280" cylinders from S&S Cycle, precision-bored to provide a substantial increase over stock while maintaining liner thickness for long-term durability. Because no engine case modifications are required, this bolt-on solution makes installation quick and hassle-free.

At the heart of the kit are forged CP pistons engineered for maximum strength under high-performance conditions. To make assembly even easier, we pre-set the piston ring gaps using a precision diamond ring filer, saving you time and ensuring a perfect fit. This kit works seamlessly with our +1mm or +2mm Ward CNC ported heads and WP camshafts to unlock the full potential of your build. While these components are optional, they are highly recommended for maximum power and airflow. Already have a camshaft or heads from another builder? No problem—this kit integrates easily with other components too.

Choosing the right compression ratio, camshaft profile, and head configuration can be overwhelming, but that’s where we come in. With decades of engine development experience, Ward Performance takes the guesswork out of building your dream engine. We’ll help you find the right combination for your setup and provide any additional parts you need to complete your build. Whether you’re chasing peak power for the street or planning a high-horsepower track monster, the 130" Big Bore Kit is the perfect foundation.

    • American-Made 4.280" Cylinders: Precision-bored and honed for maximum strength, with no need for engine case modifications.

    • Forged CP Pistons and Rings: Designed for durability and performance, with pre-set ring gaps for easy installation.

    • Cometic Head and Base Gaskets: Reliable sealing for high-performance applications.

    • Optional Ward CNC Ported Heads: Available with +1mm or +2mm CNC ported heads for optimized airflow and maximum power gains.

    • Optional Camshaft: Choose one of our Ward Performance camshafts, designed to deliver power where you need it most.

    • Every build is unique. Selecting the right compression ratio, camshaft profile, and head configuration can be a challenge. With decades of engine development experience, we’ll help you find the ideal combination for your build. Contact us for more information—we can also supply the parts needed to complete your setup.

    • 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!

Frequently Asked Questions

    • A Big Bore Kit increases your engine's size. This lets your engine take in more fuel and air, creating a much more powerful "explosion" with every stroke. The result? Significantly more horsepower and torque – meaning faster acceleration and more power on the road or track.

    • While exact gains vary based on your full setup, this kit provides a massive boost in power and torque right out of the box. For the ultimate performance, pairing it with our recommended CNC ported heads and a Ward Performance camshaft will unleash its full potential, transforming your ride into a true powerhouse.

    • No! This 130" kit is designed as a true bolt-on solution for your M8 engine. Unlike some other big bore kits, it requires NO engine case modifications, making installation more straightforward and cost-effective. Professional installation by a qualified mechanic is always recommended.

    • Not necessarily! Our 130" kit is designed to integrate well with various setups. However, for maximum performance, airflow, and horsepower gains, we highly recommend pairing it with our Ward CNC ported heads (+1MM or +2MM options available) and a Ward Performance camshaft. These are available as optional upgrades.

    • Absolutely! Choosing the perfect combination can be tricky, and that's where our decades of engine development experience come in. We're here to help you find the ideal setup for your specific needs and riding goals. Contact us directly for personalized guidance.

  • Custom Forged CP Pistons and rings

    Pre-set ring gaps using precision diamond ring filer for easy installation.

  • Cometic MLS Head and Base Gaskets

    High performance multi-layer-steel composition. Reliable sealing for high-performance builds.

  • Optional CNC Ported Heads

    Available with Ward CNC ported heads for maximum airflow and power.

  • Optional High Performance Camshafts

    This kit pairs perfectly with one of our high-performance Ward camshafts, designed to maximize power and torque where it matters most