S&S Cycle 2017+ M8 Models 129in Big-Bore Kit 4.375in Stroke Highlighted Cylinders

The biggest Big Bore possible with a slip in kit! These S&S cylinder and piston kits takes your 107" M8 to 129" and the 114" to 132"

• Works with stock crankcases (no machine work)
• Huge bore increase means huge power increase
• Powder coat finish matches factory finish
• MLS (multi-layered steel) head gaskets
• Includes Cubic Inch Cam Cover Badge
• Retains stock engine height
• 4.320" Bore
• Made in USA