S&S Cycle 4.320" Big Bore Cylinder & Piston Kit - Powder Coat for Harley Milwaukee-Eight

Unlock the full potential of your Harley Milwaukee-Eight with the S&S Cycle 4.320" Big Bore Cylinder and Piston Kit. This kit provides a massive displacement increase, transforming a 107" M8 to 129" or a 114" M8 to 132" with a direct bolt-on installation.

Why riders pick this

• Massive displacement gain for M8 engines
• 4.320" bore, no crankcase machining required
• Upgrades 107" to 129" or 114" to 132" M8s
• Powder coat finish matches factory look
• Includes MLS head gaskets and cam cover badge

Engineered for maximum power without the hassle of extensive machine work, this S&S Cycle kit bolts directly onto your stock M8 crankcases. The precision 4.320" bore cylinders, combined with optimized pistons and MLS head gaskets, deliver a significant boost in performance, ensuring your Harley-Davidson stands out from the crowd.

Unprecedented Displacement Gains

• 4.320" bore cylinders for substantial displacement increases
• Direct bolt-on installation onto stock M8 crankcases, no machining needed
• Transforms 107" M8 to 129" or 114" M8 to 132"
• Powder coat finish designed to match factory engine aesthetics
• Includes multi-layered steel (MLS) head gaskets for a reliable seal

Performance Built for Harley Riders

This S&S Cycle big bore kit is a game-changer for Milwaukee-Eight owners looking for serious power. The thoughtful design retains stock engine height, preserving your bike's original geometry. While installation is straightforward, a professional dyno tune is crucial to optimize the engine's new displacement and ensure peak performance and longevity.

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 910-0844A
• Bore Diameter: 4.320"
• Category: Engine Components / Piston Sets - Powersports
• Weight: 29.56 lb
• Country of Origin: USA

Common questions