Revolution Performance 139" Bolt On Big Bore Kit for '17-Up Harley Davidson 107 M-8 Models - Black
for 107" engines with 4-1/2" bores and 4-3/8" strokes
- Aerospace-grade all-aluminum cylinder with nickel-silicon-carbide (NSC) electroplated bore
- NSC-plated cylinders have less friction for increased horsepower, lower engine temperatures and a longer lifespan
- Includes pair of all-aluminum NSC-coated bore cylinders, custom-forged pistons with high-tension rings specifically designed for NSC cylinders and a head/base gasket set
- Replacement gasket sets available separately
- Upgraded cylinders studs and head bolts recommended
- Made in the USA
- Monster big bore kit requires case boring.
- No sleeving allows for larger bore sizes.
- BORE SIZE 4.500"
- DISPLACEMENT 139"
- STROKE LENGTH 4-1/2"
Fitments
| 2021 | Harley-Davidson | Electra Glide Revival |
| 2020-2021 | Harley-Davidson | CVO Tri Glide FLHTCUTGSE |
| 2020-2021 | Harley-Davidson | Softail Low Rider S FXLRS |
| 2020-2021 | Harley-Davidson | Road Glide Limited FLTRK |
| 2020-2021 | Harley-Davidson | Softail Standard FXST |
| 2019-2021 | Harley-Davidson | Electra Glide Standard EFI FLHTI |
| 2019-2020 | Harley-Davidson | FXDR 114 |
| 2018-2021 | Harley-Davidson | Softail Heritage Classic 114 FLHCS |
| 2018-2021 | Harley-Davidson | Softail Fat Bob 114 FXFBS |
| 2018-2021 | Harley-Davidson | Softail Fat Boy 114 FLFBS |
| 2018-2021 | Harley-Davidson | Softail Heritage Classic FLHC |
| 2018-2021 | Harley-Davidson | Softail Sport Glide FLSB |
| 2018-2021 | Harley-Davidson | Softail Slim FLSL |
| 2018-2021 | Harley-Davidson | Softail Street Bob FXBB |
| 2018-2021 | Harley-Davidson | CVO Road Glide Custom FLTRXSE |
| 2018-2020 | Harley-Davidson | Softail Breakout 114 FXBRS |
| 2018-2020 | Harley-Davidson | Softail Deluxe FLDE |
| 2018-2020 | Harley-Davidson | Softail Low Rider FXLR |
| 2018-2019 | Harley-Davidson | Softail Fat Bob FXFB |
| 2018-2019 | Harley-Davidson | Softail Breakout FXBR |
| 2018-2019 | Harley-Davidson | Softail Fat Boy FLFB |
| 2017-2021 | Harley-Davidson | Street Glide Special FLHXS |
| 2017-2021 | Harley-Davidson | Tri Glide Ultra Classic FLHTCUTG |
| 2017-2021 | Harley-Davidson | CVO Electra Glide Ultra Limited FLHTKSE |
| 2017-2021 | Harley-Davidson | Electra Glide Ultra Limited FLHTK |
| 2017-2021 | Harley-Davidson | Freewheeler FLRT |
| 2017-2021 | Harley-Davidson | Electra Glide Police FLHTPI |
| 2017-2021 | Harley-Davidson | Road King Special FLHRXS |
| 2017-2021 | Harley-Davidson | Road Glide Special FLTRXS |
| 2017-2021 | Harley-Davidson | Road King EFI FLHR |
| 2017-2021 | Harley-Davidson | Street Glide EFI FLHX |
| 2017-2021 | Harley-Davidson | Road Glide Custom FLTRX |
| 2017-2021 | 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 |
