S&S CYCLE Big Bore Cylinder Kit — 4.25" bore, 4.5" stroke, 128 cu in, Highlighted Fins – 18-23 CVO, 18, 22-23 Touring

The Big Bore cylinder kit yields excellent results with stock cylinder heads and is engineered for straightforward installation. 🇺🇸🔧

Most applications require no case boring or splitting; simply swap the cylinders unless otherwise noted. Cylinders are constructed from premium aluminum castings with cast-in iron liners for lasting durability.

• Kit includes cylinders, pistons, rings and gaskets (head, base and exhaust).
• Made in the USA.
• This project requires a skilled technician; it is the assembler's responsibility to check all clearances and assembly specifications.