Description
The S&S Cycle Sidewinder Kit delivers serious displacement gains through a proven 3-5/8″ bore design, giving you the cubic inches and horsepower needed to dominate on the track or street. This is a foundational engine rebuild kit built on S&S’s reputation for precision manufacturing—not a shortcut solution. If you’re committed to extracting maximum performance from your Harley’s bottom end, this kit pairs aggressive bore geometry with quality internals to make it happen.
- 9.75:1 compression pistons
- 3-5/8″ bore cylinders
- Standard flywheel assembly
- Rings and gaskets included
- 77-89 style pinion required
- Cases require boring
- Crankcase clearancing needed
- Fits 91-99 engine cases
- MPN: 91-7661
- Professional installation recommended
