Complete 130” Harley-Davidson Big Bore Kit from Ward Performance, featuring CNC ported heads, pistons, camshaft, and gaskets.

Ward 130” BIG BORE KIT

    • 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.

    • For HD M8 Oil Cooled and Twin Cooled Models.

Ward Performance 143” Big Bore Kit with ported heads, big bore cylinders, forged pistons, and race cam for max displacement and power.

WARD 143” BIG BORE KIT

    • Cylinders Resleeved, Bored & Honed with Torque Plates to 4.500"

    • CP Pistons and Rings (Ring Gap Set)

    • Cometic Head and Base Gaskets

    • Case Boring Required

    • Ward Performance 143 Camshaft (additional cost)

    • +2mm CNC ported heads (additional cost)

    • For HD M8 Oil Cooled and Twin Cooled Models.