S&S 128" Big Bore Bolt-In Kit for Milwaukee 8 M8 114" / 117"

Transform your riding experience with a premium Big Bore Bolt-In Kit from S&S Cycle. Engineered specifically for Harley-Davidson Milwaukee-Eight engines, this kit provides a significant increase in displacement and power without requiring complex engine case modifications. Whether you are navigating city streets on a Softail or eating up miles on a Touring model, this performance upgrade delivers the reliability and torque S&S is famous for.

Designed with precision engineering, these kits feature an updated profile that maintains a factory-style fitment while pushing the boundaries of M8 performance. It is the ideal solution for riders looking to maximize their engine's potential through a seamless, bolt-in installation process that preserves the integrity of the original engine cases.

• High-performance 4.250" bore for increased displacement.
• Updated profile featuring a stock bolt pattern of 4.840".
• Efficient bolt-in design allows for power gains without machining the crankcase.
• Compatible with a wide range of Milwaukee-Eight Touring and Softail platforms.
• Not for 121" CVO models.