S&S Cycle 910-0763A 131" Stroker Cylinder and Piston Kit Black M8

The S&S Cycle 131" Stroker Cylinder and Piston Kit is a high-performance bolt-on engine upgrade designed specifically for Harley-Davidson Milwaukee Eight big twin motorcycles. This complete kit transforms your M8 engine into a powerful 131 cubic inch beast when paired with an S&S 4.625" stroker flywheel, delivering massive displacement and performance gains over stock.

Key Features:

• 4.25" bore cylinders with forged 11:1 compression piston design
• Wrinkle black powder coat finish with non-highlighted fins matches factory appearance
• Bolt-on installation works with stock crankcases - no modifications required
• Retains original engine serial numbers and stock engine height
• Includes .045" multi-layer steel (MLS) head gaskets for superior sealing
• Includes 131" cam cover badge
• Built to tighter tolerances with higher quality materials than OEM
• Made in the USA

This cylinder and piston kit represents decades of S&S engineering expertise in big bore performance. The precision-forged pistons and precision-machined cylinders provide a solid foundation for significant power increases while maintaining reliability. Must be used with S&S stroker flywheels (part numbers 320-0605 or 320-0620, sold separately) to achieve the full 131 cubic inch displacement.