Description
S&S 128″ Big Bore Kit for M8 Touring and Softail Models
This bolt-on big bore kit from S&S features the largest cylinder bore possible without requiring machining of the crankcases.
- For 114″ & 117″ M8 Engines
- Bolt-on kit without requiring machining of the crankcase
- 4.25 bore & 4.5″ stroke
- 11:1 forged pistons
- Original engine serial numbers are retained
- MLS (multi-layered steel) head gaskets
- Retains stock engine height
- Includes cam cover badge
- All necessary gaskets and hardware required for installation is included
- Made in the USA
- Big Bore kit yields excellent results with stock cylinder heads
- Easy installation no need to bore or split existing cases, just swap the cylinders (unless otherwise noted)
- Cylinders are constructed from premium aluminum castings with cast-in iron liners
- Kit includes cylinders, pistons, rings and gaskets (head, base and exhaust)
- Project requires a skilled technician. It is the responsibility of the person assembling the parts to check all clearances and assembly specifications.
More Big Bore kits HERE.
Fitment Guide
| 2020 | Harley-Davidson | Softail Low Rider S FXLRS | – | – |
| 2020 | Harley-Davidson | CVO Tri Glide FLHTCUTGSE | – | – |
| 2020 | Harley-Davidson | Road Glide Limited FLTRK | – | – |
| 2020 | Harley-Davidson | Softail Standard FXST | – | – |
| 2019-2020 | Harley-Davidson | FXDR 114 | – | – |
| 2019-2020 | Harley-Davidson | Electra Glide Standard EFI FLHTI | – | – |
| 2018-2020 | Harley-Davidson | Softail Deluxe FLDE | – | – |
| 2018-2020 | Harley-Davidson | Softail Low Rider FXLR | – | – |
| 2018-2020 | Harley-Davidson | Softail Breakout 114 FXBRS | – | – |
| 2018-2020 | Harley-Davidson | Softail Fat Bob 114 FXFBS | – | – |
| 2018-2020 | Harley-Davidson | Softail Fat Boy 114 FLFBS | – | – |
| 2018-2020 | Harley-Davidson | Softail Heritage Classic 114 FLHCS | – | – |
| 2018-2020 | Harley-Davidson | Softail Heritage Classic FLHC | – | – |
| 2018-2020 | Harley-Davidson | Softail Slim FLSL | – | – |
| 2018-2020 | Harley-Davidson | Softail Sport Glide FLSB | – | – |
| 2018-2020 | Harley-Davidson | Softail Street Bob FXBB | – | – |
| 2018-2020 | Harley-Davidson | CVO Road Glide Custom FLTRXSE | – | – |
| 2018-2019 | Harley-Davidson | Softail Breakout FXBR | – | – |
| 2018-2019 | Harley-Davidson | Softail Fat Bob FXFB | – | – |
| 2018-2019 | Harley-Davidson | Softail Fat Boy FLFB | – | – |
| 2017-2020 | Harley-Davidson | Electra Glide Ultra Limited FLHTK | – | – |
| 2017-2020 | Harley-Davidson | Street Glide Special FLHXS | – | – |
| 2017-2020 | Harley-Davidson | Road Glide Special FLTRXS | – | – |
| 2017-2020 | Harley-Davidson | Freewheeler FLRT | – | – |
| 2017-2020 | Harley-Davidson | CVO Electra Glide Ultra Limited FLHTKSE | – | – |
| 2017-2020 | Harley-Davidson | Road King Special FLHRXS | – | – |
| 2017-2020 | Harley-Davidson | Tri Glide Ultra Classic FLHTCUTG | – | – |
| 2017-2020 | Harley-Davidson | Electra Glide Police FLHTPI | – | – |
| 2017-2020 | Harley-Davidson | Street Glide EFI FLHX | – | – |
| 2017-2020 | Harley-Davidson | Road King EFI FLHR | – | – |
| 2017-2020 | Harley-Davidson | Road Glide Custom FLTRX | – | – |
| 2017-2020 | Harley-Davidson | CVO Street Glide FLHXSE | – | – |
| 2017-2019 | Harley-Davidson | Electra Glide Ultra Limited Low FLHTKL | – | – |
| 2017-2019 | Harley-Davidson | Road Glide Ultra FLTRU | – | – |
| 2017-2019 | Harley-Davidson | Electra Glide Ultra Classic EFI FLHTCUI |
Install Video
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