S&S 4.320" M8 Big Bore Black Cylinder & Piston Kit W/Highlighted Fins (910-0847)
- Huge bore increase means huge power increase
- Works with stock crankcases (no machine work)
- Powder coat finish matches factory finish
- MLS (multi-layered steel) head gaskets
- 4.320" Bore
- 4.5" stroke length
- Black granite with highlighted fins
- Retains stock engine height
- Includes Cubic Inch Cam Cover Badge
- Made in USA.
| Compatible Vehicles | |||
| Years | Make | Make | Notes |
| 2023 | Harley-Davidson | Breakout FXBR 117 | |
| 2018-2020 | Harley-Davidson | Breakout FXBRS 114 | |
| 2023 | Harley-Davidson | Electra Glide Highway King FLHFB | |
| 2021 | Harley-Davidson | Electra Glide Revival | |
| 2018-2023 | Harley-Davidson | Fat Bob FXFBS 114 | |
| 2018-2023 | Harley-Davidson | Fat Boy FLFBS 114 | |
| 2019-2020 | Harley-Davidson | FXDR FXDRS 114 | |
| 2018-2023 | Harley-Davidson | Heritage Classic FLHCS 114 | |
| 2022 | Harley-Davidson | Low Rider El Diablo | |
| 2020-2021 | Harley-Davidson | Low Rider S FXLRS 114 | |
| 2022-2023 | Harley-Davidson | Low Rider S FXLRS 117 | |
| 2022-2023 | Harley-Davidson | Low Rider ST FXLRST 117 | |
| 2020-2023 | Harley-Davidson | Road Glide Limited FLTRK | |
| 2019-2023 | Harley-Davidson | Road Glide Special FLTRXS | |
| 2022-2023 | Harley-Davidson | Road Glide ST FLTRXST | |
| 2019 | Harley-Davidson | Road Glide Ultra FLTRU | |
| 2019-2023 | Harley-Davidson | Road King Special FLHRXS | |
| 2021-2023 | Harley-Davidson | Street Bob FXBBS 114 | |
| 2019-2023 | Harley-Davidson | Street Glide Special FLHXS | |
| 2022-2023 | Harley-Davidson | Street Glide ST FLHXST | |
| 2023 | Harley-Davidson | Tri Glide Ultra Classic FLHTCUTG | |
| 2019-2022 | Harley-Davidson | Tri Glide Ultra FLHTCUTG | |
| 2022 | Harley-Davidson | Tri Glide Ultra FLHTCUTG G.I. Enthusiast Collectio | |
| 2019-2023 | Harley-Davidson | Ultra Limited FLHTK | |
| 2019 | Harley-Davidson | Ultra Limited Low FLHTKL | |