S&S CYCLE Big Bore Cylinder Kit — Bore 4.125 in, Stroke 4.625 in, 124 cu in – 07-15 Dyna, 07-15 Touring, 07-15 CVO, 10-15 Trike, 07-15 Softail

The Big Bore Cylinder Kit delivers excellent results while using your stock cylinder heads.

Easy installation — no need to bore or split existing cases; simply swap the cylinders unless otherwise noted.

Cylinders are constructed from premium aluminum castings with cast-in iron liners. The kit includes pistons, rings and gaskets for head, base and exhaust.

Made in the USA. This project requires a skilled technician; the assembler is responsible for checking all clearances and assembly specifications.