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Introducing the next generation of Proven Performance for your 2018-2024 H-D® Softail® Models, the MK136B Engine . This is the newest version of the complete crate engines S&S is known for, ready to install in your M8 Softail. S&S took the MKB-Series Crankcases, married them to the 136" cylinders and flywheels, and then fit High-flow cylinder heads with +1mm Valves and .605" springs. This is everything you need to have the largest, most powerful, and most reliable crate engine on the market today.
- High-strength alloy used in cylinder head casting, improved strength at high temperatures
- High-flow cylinder heads with premium seats, guides, valves, springs, and seals
- Valves are .030" longer than stock for improved valvetrain geometry
- 1mm oversized intake and exhaust valves
- Race only, not intended for street use
- All premium quality components
- Sprocket shaft spacer included
- .605" max lift valve springs
- Billet aluminum covers
This Part Fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2018-2020 | Harley-Davidson | FLDE Deluxe 107 | Base |
| 2018-2019 | Harley-Davidson | FLFB Fat Boy 107 | Base |
| 2018-2023 | Harley-Davidson | FLFBS Fat Boy 114 | Base |
| 2018-2021 | Harley-Davidson | FLSB Sport Glide 107 | Base |
| 2018-2021 | Harley-Davidson | FLSL Softail Slim 107 | Base |
| 2018-2019 | Harley-Davidson | FXBB Street Bob 107 | Base |
| 2021-2024 | Harley-Davidson | FXBBS Street Bob 114 | Base |
| 2018-2019 | Harley-Davidson | FXBR Breakout 107 | Base |
| 2023-2024 | 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 |
| 2021 | Harley-Davidson | FXLRS Low Rider S 114 | Base |
| 2022-2024 | Harley-Davidson | FXLRS Low Rider S 117 | Base |
| 2022-2024 | Harley-Davidson | FXLRST Low Rider ST 117 | Base |
| 2020-2024 | Harley-Davidson | FXST Softail Standard 107 | Base |