S&S 128" Big Bore Kit for M8 Touring and Softail Models

• For 114" & 117" M8 Engines
• Bolt-on kit without requiring machining of the crankcase
• 4.25 bore & 4.5" stroke
• 11:1 forged pistons
• Original engine serial numbers are retained
• MLS (multi-layered steel) head gaskets
• Retains stock engine height
• Includes cam cover badge
• All necessary gaskets and hardware required for installation is included
• Made in the USA
• Big Bore kit yields excellent results with stock cylinder heads
• Easy installation no need to bore or split existing cases, just swap the cylinders (unless otherwise noted)
• Cylinders are constructed from premium aluminum castings with cast-in iron liners
• Kit includes cylinders, pistons, rings and gaskets (head, base and exhaust)
• Project requires a skilled technician. It is the responsibility of the person assembling the parts to check all clearances and assembly specifications.

Fitment Guide