Building massive power reliably just got easier! Our new MK-Series B Crankcases can be paired with our 136" cylinder kit and 4 5/8" Stroker Crank to give you a rock-solid build. These cases scrape more oil than the stock ones, have a large volume sump, and fit in a stock frame without modification.
This Part Fits:
| Year |
Make |
Model |
Submodel |
| 2018-2020 |
Harley-Davidson |
FLDE Deluxe 107 |
Base |
| 2018-2019 |
Harley-Davidson |
FLFB Fat Boy 107 |
Base |
| 2025 |
Harley-Davidson |
FLFB Fat Boy 117 |
Base |
| 2018-2023 |
Harley-Davidson |
FLFBS Fat Boy 114 |
Base |
| 2018-2021 |
Harley-Davidson |
FLHC Heritage Classic 107 |
Base |
| 2018-2024 |
Harley-Davidson |
FLHCS Heritage Classic 114 |
Base |
| 2018,2020-2021 |
Harley-Davidson |
FLSB Sport Glide 107 |
Base |
| 2018,2020-2021 |
Harley-Davidson |
FLSL Softail Slim 107 |
Base |
| 2025 |
Harley-Davidson |
FLSTFI Fat Boy Gray Ghost |
Base |
| 2018-2020 |
Harley-Davidson |
FXBB Street Bob 107 |
Base |
| 2025 |
Harley-Davidson |
FXBB Street Bob 117 |
Base |
| 2021-2024 |
Harley-Davidson |
FXBBS Street Bob 114 |
Base |
| 2018-2019 |
Harley-Davidson |
FXBR Breakout 107 |
Base |
| 2023-2025 |
Harley-Davidson |
FXBR Breakout 117 |
Base |
| 2018-2020 |
Harley-Davidson |
FXBRS Breakout 114 |
Base |
| 2019-2020 |
Harley-Davidson |
FXDRS FXDR 114 |
Base |
| 2018-2019 |
Harley-Davidson |
FXFB Fat Bob 107 |
Base |
| 2018-2023 |
Harley-Davidson |
FXFBS Fat Bob 114 |
Base |
| 2018-2020 |
Harley-Davidson |
FXLR Low Rider 107 |
Base |
| 2020-2021 |
Harley-Davidson |
FXLRS Low Rider S 114 |
Base |
| 2022-2025 |
Harley-Davidson |
FXLRS Low Rider S 117 |
Base |
| 2022-2025 |
Harley-Davidson |
FXLRST Low Rider ST 117 |
Base |
| 2022 |
Harley-Davidson |
FXRST Low Rider El Diablo 117 |
Base |
| 2020-2024 |
Harley-Davidson |
FXST Softail Standard 107 |
Base |
