S&S Cycle

S&S Cycle 2018+ M8 Softail Models MK-Series Crankcase Assembly

SKU 310-1326

MPN ssc310-1326

$2849.95 · Available to order

S&S Cycle 2018+ M8 Softail Models MK-Series Crankcase Assembly

S&S Cycle 2018+ M8 Softail Models MK-Series Crankcase Assembly

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.

Confirmed vehicle fitment
YearsMakeModelSubmodelDrive
2020–2021Harley-DavidsonFXLRS Low Rider S 114Base—
2018–2023Harley-DavidsonFXFBS Fat Bob 114Base—
2025Harley-DavidsonFXBB Street Bob 117Base—
2018–2024Harley-DavidsonFLHCS Heritage Classic 114Base—
2018–2020Harley-DavidsonFXBRS Breakout 114Base—
2018Harley-DavidsonFLSL Softail Slim 107Base—
2025Harley-DavidsonFLFB Fat Boy 117Base—
2018–2020Harley-DavidsonFXBB Street Bob 107Base—
2022–2025Harley-DavidsonFXLRST Low Rider ST 117Base—
2020–2021Harley-DavidsonFLSL Softail Slim 107Base—
2018Harley-DavidsonFLSB Sport Glide 107Base—
2018–2019Harley-DavidsonFXBR Breakout 107Base—
2018–2021Harley-DavidsonFLHC Heritage Classic 107Base—
2018–2019Harley-DavidsonFLFB Fat Boy 107Base—
2019–2020Harley-DavidsonFXDRS FXDR 114Base—
2018–2019Harley-DavidsonFXFB Fat Bob 107Base—
2023–2025Harley-DavidsonFXBR Breakout 117Base—
2022Harley-DavidsonFXRST Low Rider El Diablo 117Base—
2018–2020Harley-DavidsonFLDE Deluxe 107Base—
2025Harley-DavidsonFLSTFI Fat Boy Gray GhostBase—
2018–2020Harley-DavidsonFXLR Low Rider 107Base—
2020–2021Harley-DavidsonFLSB Sport Glide 107Base—
2020–2024Harley-DavidsonFXST Softail Standard 107Base—
2022–2025Harley-DavidsonFXLRS Low Rider S 117Base—
2018–2023Harley-DavidsonFLFBS Fat Boy 114Base—
2021–2024Harley-DavidsonFXBBS Street Bob 114Base—
Specifications
CategoryEngine Components
Sub-CategoryCrankshafts
UPC310-1326
CARB ApprovedYes
Special OrderYes
Weight49.2 lb
Dimensions (L×W×H)24.6 × 19.9 × 15.9 in

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