Description
If you’re running a stock M8 and looking to unlock measurable horsepower and torque gains without splitting cases, the S&S CYCLE Big Bore kit delivers straightforward power. Premium cast-iron lined aluminum cylinders paired with matched pistons and rings ensure reliability and durability where it counts—on the road and track. This is a bolt-on big bore solution that rewards proper installation with noticeable performance improvements.
- Manufacturer: S&S CYCLE
- Part Number: 910-0685
- Platform: Harley-Davidson M8
- Kit Type: Big Bore
- Cylinder Material: Premium aluminum castings
- Liner Material: Cast-in iron
- Included Components: Cylinders, pistons, rings, gaskets
- Gasket Types: Head, base, exhaust
- Installation: Bolt-on, no case splitting
- Finish Options: Black or silver powder-coat
- Country of Origin: U.S.A.
- Skill Level: Requires skilled technician
- Note: Verify all clearances and assembly specifications






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